Hello, new indoor grower here

[Ashton586]

Also in my first grow! But one problem I’m having is keeping the temperature up in the tent when the light are on And when they’re off! Any tips for keeping a steady temp in a grow tent? also tent is in a poor insulted room

[Ratch33]

How to Lower Humidity in Grow Tent When It’s too High

Humidity- the blessing and at the same time, the curse for an indoor grow system. Just like temperature, humidity has an important role to play when it’s about the quality and quantity of your indoor gardening yield.

Having said that, when the grow tent humidity gets too high, it might bring on the worst nightmare for you as a grower. Indoor gardening rookies often underlook this and end up with problems like powdery mildew or bud root etc.

We hope, you are not one of them who’d regret the entire money, time and effort just because they couldn’t deal with a situation like this.

This particular article is, however, the end result of our week-long research on EVERY possible way to keep the humidity of your grow room under control. We’ve provided both quick and long term fixes, with the list of reasons that might induce humid air anyway.

Stay sticked until the end.

Why? Why? Why?

So, we’ve got a situation where there is too much humidity in grow tent. But the whole incident was not a bolt from the blue. It must have some reasons why the Rh level had got high, and understanding the reasons is quite important to figure a way out.

Agreed? Here is a list of potential suspects-

Increased Transpiration

As plants grow bigger, so does the size of their leaves. And it’s a botany 101 that larger leaves will exhale more vapor in the air. If you don’t cope with your ventilation system up accordingly, the humidity will raise immediately.

This can also take place if you increase the number of plants all of a sudden.

Open Water Surfaces

Open water surfaces are direct suppliers of water vapor into the air. It can be the nutrient reservoir, the wet floor of the room or just any other container of water. In case it’s near an oscillating fan, the airflow over the surface will turn more water into vapor, and bammm! Thermodynamics is in action.

Too Humid Outside Environment

The average humidity in Alaska is 77.1%, and in Florida, that’s 74.5%. The list continues with states of Louisiana, Mississippi, Hawaii, Michigan, etc. (Here is the full report)

This quite explains how growing in a grow room in these kinds of places is hard. The slightest leak in the insulation system between the grow space and the outside environment will give you a surprising rise in the humidity.

Overwatering

Overwatering the plants will make the soil soggy, and it will also force the plant leaves to leave more vapor in the air. Both wet soil and over-transpiring plant leaves are dangerously liable to raise the grow tent too humid.

High Humidity is Bad, Here’s Why-

There are a number of vulnerable effects of too low humidity in a grow room. But too much of it isn’t a blessing either. Here are some quick results when your grow room gets too humid-

• Unwanted biological growth like bud molds, powdery mildews, etc.
• Too much moisture buildup will welcome bud rotting or flower rotting, which can’t be seen until you’re in the harvesting stage.
• Restricting the plant’s ability to intake CO2, followed by restricting photosynthesis.
• A vapor-saturated air hinders further transpiration process of plants. Resultantly, the overall plant metabolism rate decreases.
• Plants love humid air while they’re tender, and less humid air while they’re mature. If it still remains in high humidity while grown up, it will prohibit the growth rate and health quality of the plants.

How High is ‘Too High’ for Grow Room Humidity?

As we know, humidity level varies from growth stage to stage. So, it’s not possible to assign a fixed ‘Rh Percentage’ as an indicator between ideal and too high humidity level.

Check Our Recent Buying Guide about How to Hang Grow Lights From Ceiling- Explained in 6 Steps

But the rule of thumb is, the overall range of humidity in a grow room lies below 60%. A raise of humidity level above 60% can bring on several damages to the crop, which we’ve just discussed in the previous section.

However, to have a clear concept of what’s the strict Rh limit of each grow stages, here is a quick stage-wise humidity range chart-

The Correct Humidity Levels for Different Grow Stages

Germination/Cloning: Rh 75-85%

At this stage, the initial growth of the plant’s roots takes place. So a high humidity level is mandatory. Humidity domes are often used to increase the Rh of the imminent air above the seedlings.

Vegetation: Rh 40-60%

Humidity has to be a bit high because grow plant leaves would require enough water in the air. A partial portion of the water consumption is done through roots as well. But as they’re not fully developed yet, leaves have to keep intaking water.

Flowering: Rh 35-50%

This is the stage where high Rh starts to show it’s bad signs. So it’s very crucial from this point to ensure no raise in humidity. Otherwise, molds, rotten buds, etc will start to take place.

At the beginning of the flowering stage, the Relative humidity should be kept within 40-50%. But as the buds start to produce a harvest, growers lower it down to 35-40%. And this has to be done gradually without any major, sudden drop in the Rh.

Harvesting/Drying: 30-40%

At this stage, crops start to dry and result in harvest. But still, we have to keep a 30-40% humidity level not to let the buds dry too fast. Some growers love to stick to a bit higher humidity(50%) in order to let his buds dry slower. This is anyway, improves the quality of the cured buds.

Germination/Cloning	Vegetation	Flowering	Harvesting/Drying
75-85% Rh	40-60% Rh	35-50% Rh	30-40% Rh

How to Decrease Humidity in Grow Tent/Room?

Active Ways

When you’re seeking steps on how to bring humidity down in grow room or room, things are just not easy to deal with. Any step will take enough time to take the Rh down. So you have to stick to the quickest possible ones.

The couple of methods that we’re about to discuss are, particularly for such situations. Here you go-

Use A Dehumidifier

It’s quite obvious that to turn humidity down, you’ve got to call our friend in need- the grow room dehumidifier.

But before putting your money on just any dehumidifier, take a minute to think about the right size for your grow room setup.

So, what defines a good dehumidifier that can take the exact humidity out that you need to? Here go some points of consideration-

1. It should be of the exact dehumidifying capacity that your grow system requires for. Technically, it’s supposed to take off the same amount of vapor that your plants transpire through their leaves. This capacity is measured in pints.
2. If you’re living in a humid area, make sure your dehumidifier can be attached to the drainage system.
3. It should have a large enough water tank.
4. It should sport an automatic timer or an automatic shut off feature(when the tank is full).
5. It should be gentle to the electricity bills.

Once you’ve got the right size of a dehumidifier, you’ve got to put it at the right place anyway. Also, avoid plugging these dehumidifiers to the electrical extension leads.

Our favorite dehumidifier for grow room: Ivation GDM30
Our favorite dehumidifier for grow room: hOmeLabs 1,500 Sq. Ft Energy Star Dehumidifier

Use An Air Conditioner

We know that the temperature and the humidity of a grow room go hand to hand. If the temperature rises, the ability to hold water vapor in it raises too, and you see a direct boost of the Rh in your room.

Check Our Recent Buying Guide about How Many Watts Per Square Foot for Led Grow Lights You Need?

On the other hand, if you manage to bring the temperature down, it will remove humidity from grow tent/room at a good extent.

Having said that, using the right size of AC units is crucially important. Otherwise, it will either end up in condensation or will still be unable to control the temperature and humidity.

Find more about this later in this post.

Passive Ways

For smaller grow systems like 4×4, 5×5, 8×8 grow tents, using a dehumidifier or AC is not a convenient solution to take humidity down. There are several passive ways that are well enough to deal with this problem in such indoor grow systems.

We’ve got a list of 3 actionable passive ways to do that. Have a look-

Boost the Ventilation Up

Talking about passive ways of lowering humidity level down, boosting the air circulation tops the list. One of the root causes of excess humidity buildup in your grow room is the inability to vent humid air out at proper rate.

Simply put- exchanging the humid air with the fresh, ambient outside air will put the Rh percentage down.

Once you’ve got a high humidity situation, these are the things to do in order to boost the ventilation-

• Widen your intake hole, or create a new one. This will let more air in, and increase the efficiency of an exhaust fan. In case you use intake fan instead of holes, boost up the power(CFM) of it.
• Instead of using ‘just’ oscillating wall fans, using floor fans as air circulators throughout the grow room is an effective idea. These fans can pull air through the plant canopy and ensure a proper exchange of old, humid air with fresh ones.
• Use an atmospheric controller with humidity settings. It will automatically set the exhaust/inlet fan speed according to the humidity level of the room.
• Put inline fans in charge of taking humid air out. More importantly, make sure that the fan is powerful enough, and is of the same diameter to your ducting. Keep an eye on the noise reduction of this buzzy thing as well.

Use A Thermostatically Controlled Block Heater

Got a high humidity in grow tent at night?

Spikes in Rh level and condensation can take place more often during the dark hours comparing to the light hours. As you turn the lights off, the temperature goes down. With enough of a drop in temperature, you would see moisture buildup around the lights, which is termed as humidity fluctuation.

Remedy?

When the lights go off in your grow room, using a thermostatically controlled block heater to keep the temperature close to the light-on level.

Defoliate the Plant Leaves

We’ve mentioned that when plant leaves grow bigger they become a bigger source of water transpiration into the nearby air. Result? Quick raise in grow room humidity.

As a passive fix of getting humidity down in grow tent, you can defoliate some of the extremely large plant leaves. While removing leaves, you have to leave enough of them to the plants so that processes like photosynthesis still goes on normally.

Comparing the expense, it’s a quite cheap way to lower humidity in grow tent as well.

Things to Do to Avoid Further Raise in Humidity

How can i lower the humidity in my grow tent for good? Well, here are some actions that you can take to prevent further raise in grow tent humidity–

Don’t Depend on One-dimensional Ventilation

A humidity 101 is, if a proper ventilation goes on across the entire grow room, the air will never be saturated with water vapor. To make sure it happens, you can’t depend on the oscillating fans only. Because they can only reduce the temperature of the plant canopy.

Check Our Recent Buying Guide about 10 Ways on Raising Humidity in Grow Tent [Budgetwise]

So, how do you induce a multi-dimensional ventilation system? Well, here are some suggestions-

1. Ensure multiple inlet holes if you’re growing in a tent. In case of room, source air through more than one intake fans.
2. Ensure proper air circulation throughout both the bottom(floor-fans) and top part(wall-mount oscillating fans) of the plant canopy. Don’t let the CO2-rich, heavy air build up on the floor.

Deduce Exposed Water Surfaces

It’s a quite simple and cheap hack to execute but turns out to be super effective in order to lower down the grow room humidity. And that is to deduce naked water surfaces in the grow room.

Now, from where these exposed water surfaces come?

1. Stagnant water that doesn’t pool on the ground.
2. Water reservoirs.

Do deal with the first one, you need to ensure a proper drainage system throughout the entire grow system. And to terminate the second one, simply put covers on each and every water reservoirs you’ve got in the room.

Insulate Your Grow Space from Outside Humidity

Sometimes, you see the humidity level goes higher and higher no matter how much effort you put after putting it down.

That’s because, maybe, your indoor garden is in direct touch with a too-humid outside environment. The area where you live in might have a higher humidity than usual, just like New Mexico or Colorado.

To fix this up, commercial growers often use barriers like foam insulators, etc to prevent this situation. When it’s about a grow tent instead of grow room, insulating the grow area becomes way easier though.

Use Soil That Absorbs Vapor

To get rid of humidity in grow tent, an effective step can be using soil that can absorb water and keep the Rh underneath. A good example of such soil is sandy soil.

However, make sure your plants don’t have any issues in growing in such mediums.

Use The Right Size of AC Units

Both oversized and undersized AC units may give a spike to the temperature and humidity level.

For oversized AC units, the dead band turns out to be pretty short, which gives the nearby air a rise in humidity. And the undersized AC units, on the other hand, induces withering as a problem for indoor plants. Which might create a problematic climate for the plants, high humidity being one of them.

Summary line? Always use the right size of AC units that can run consistent cycles for the longest period.

Keep an Eye on Your Humidity Level

This is not a ‘prevention’ to reduce humidity in grow tent. But using a hygrometer can keep your eyes on the exact humidity level your tent/room is going through.

[Ratch33]

How Long to Keep Fans on in Grow Room?

Take a look at your garden outdoor or the local park. You’ll see how perfectly mother nature ensures an abundance of natural winds for plants. And as an indoor grower, you’ve to play the same role for your plants. At least, as much as you can.

To keep the airflow on, it’s important to buy the right fan, set it on the right power and learn how long to keep the fan on in grow room. And that’s what this post is all about.

For people who’re in a rush, here is a snippet of what we’ll be saying throughout the whole content-

When it’s the light period, the usual advice is to keep all fans moving. Check the temperature outside during dark hours/night and set the scrubber fans accordingly. During flowering or seedling stages, ensure the abundance of dry air and CO2 by running inline fans. However, keep the oscillating fan rolling in every situation.

Interested in a more broken-down discussion? Here you go:

What Roles Do Fans Play In Ventilation?

Fans do play the most important role in the whole ventilation system of your grow room- no denial on that. Before you decide the on-off cycle of the fans, it’s important to keep their functions in mind.

So let’s have a glimpse at what it does for the whole system-

A) To Keep Plants Breathing

Plants respire by inhaling the CO2 around the leaves and grow through the process of photosynthesis. Additionally, the process is continuous on both nights and days.

In ideal growing environments, plants use up the CO2 surrounding their leaves every 20 or 30 minutes. So, you need to keep the airflow going to let the plants breathe. And fans are the only tool in rescue.

B) Keeping The Temperature Comfortable

Fans keep the air flowing, and that keeps the temperature under control. Lack of regular air exchange through fans will increase the temperature inside, which would be even worse due to the radiant heat from the lights(even when they are off).

C) Maintain the Correct Humidity Level

Too much humidity brings on unexpected pathogens to take hold. And what’s the most frequent reason for such a rise in humidity? Poor airflow- you guessed it right! So fans are, once again, the tool you have to rely on to keep humidity levels under control.

Check Our Recent Buying Guide about Grow Room Fan Size Calculator with Size-wise CFM

D) To Keep The Odor Under Control

Another secondary but important thing fans(especially exhausts) do is to keep the odor under control. But, again, if you’ve been growing for quite some time, you might be well aware of its importance.

Oscillating or Inline Fans- Which Ones We’re Talking About?

Fans are of two kinds in any grow room- inline fans for extracting/supplying air and oscillating fans to keep air circulation on. So as long as we’re talking about keeping fans on/off, we need to define which one of them you’re dealing with.

I) Inline/Extractor Fans

They’re in charge of bringing/extracting air from or to the growing space. Another important role they play is to keep the temperature under control. And that mostly depends on the presence of lights.

So, the light/dark cycle of the plants plays a massive role in deciding when to keep inline fans on and when to shut them off.

II) Oscillating Fans

These do the job of moving the air around the grow room. Whether inline fans are on or off, it’s important to prevent CO2 or humidity build-up around the leaves, and that’s why oscillating fans are in.

Therefore, oscillating fans are likely to be running for more hours compared to inline fans. In most cases, it’s 24 hours a day.

Case 1: Based On Light/Dark Hours

a) How Long to Keep Fans On and Why Light’s Are On?

It produces a tremendous amount of heat and moisture while the lights are on in your grow room. So fans should be circulating at their level best throughout the hours.

i) Inline Fans

As long as the light system is on, you need to keep every inline air exchange system working- that’s the rule of thumb.

The air exchange demand based on the heat and humidity produced can be determined through a cfm calculator. However, you should custom the fan speeds based on that.

ii) Oscillating Fans

Same as the inline fans. Keep them rolling throughout the entire light period. It’s best to stick them to their maximum speed if it doesn’t reach trouble with the plants.

b) How Long to Keep Fans On Why Light’s Are Off?

As long as the lights are off, the heat production will be stopped. So although there will be radiant heat roaming around, that will diminish after a while.

i) Inline Fans

Right after 15-20 minutes after the lights are off, you can reduce the speed of the inline fans using a speed controller. Then, after a few hours(while the temperature and humidity are ambient) of doing so, you can run them on/off at a regular frequency.

Check Our Recent Buying Guide about How to Raise Humidity in Grow Room Without Humidifier?

For example- you can keep using them for the first 15 minutes of each hour and keep them off for the rest of the hour. And keep continuing the process until the next light period.

ii) Oscillating Fans

When lights are no more on plants, no more heat is generated. And the photosynthesis process takes a break. However, plants keep breathing and leaving vapors around the leaves.

So, oscillating fans still need to be on duty. But you can deduce the speeds by a few degrees with the default speed controller they come with. And keep them rolling like that till the next light period.

Case 2: Based On The Stage Your Plants Are In

a) How Long to Run Fan on Seedlings Stage

For growers who grow their plants, ensuring proper ventilation is a must from the very beginning. And it all starts from the seedling stage.

New seedlings are quite vulnerable to diseases sourced from damping-off air. So, you need to ensure regular air circulation around them 24/7.

Depending on the temperature and humidity, you may schedule the exhaust fans, but the oscillating stand-up or tower fans should always be rolling on. Thus, it can prevent the soil from being dry and keep a gentle breeze whining around the seedlings.

b) How Long to Run The Fan In The Flowering Stage?

Flowering is the most important part of the whole growing process, especially for cannabis growers.

As always, both exhaust and oscillating fans should be running during the light hours. But when it comes to dark hours, you need to do some quickie maths.

If you’ve 2-3 oscillating fans, 1 intake fan and 1 exhaust fan, keep the oscillating fans on for the entire dark period. And turn the other fans off after 1 hour after the light goes off. And turn them on again ½ hours before you turn the lights on again.

The adjustable tilt might not be as much as that of others, but the 90° oscillation definitely makes up for that bit. In addition, it comes in a decent budget that makes it one of the best grow tent fans.

Pros:

• Durable construction with hard metal blades
• Powerful motor to push air in crazy amounts
• 3 speeds that are controlled by a lever
• 90° oscillation range
• ETL certified

Cons:

• Relatively pricier compared to other wall mount fans
• Not fully adjustable tilt compared to other models

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5. Hydrofarm HORF8 Active Air 7.5W Ultra Quiet Brushless, 8″ Clip-on Fan -Easiest to Use


Hydrofarm HORF8 Active Air 7.5W Ultra Quiet Brushless, 8″ Clip on Fan, 8″,…

• 7.5W brushless motor for longer life
• Energy efficient, low voltage
• Ultra quiet operation
• Clips to flood tables for air flow under foliage
• Great for small gardens

Buy on Amazon

The ​Hydrofarm HORF8 Active Air 7.5W is an 8-inch clip-on ​fan that’s ultra-quiet and brushless. It’s uniquely designed in a sturdy clip-on design that can be attached to the grow tent poles of your indoor garden to prevent stagnant air and provide even ventilation for the optimal plant growth of your tent plants.

The clips attached to this clip-on fan pole come with a 0.59-1 inch diameter which is designed to cling firmly onto the pole to prevent it from sliding down. In addition, the ​Hydrofarm HORF8 Active Air clip-on fan is ultra-quiet and securely built. The unit measures 1.5 pounds, while the fan measures 8.5 x 8.25 x ​6.75 inches with a ​7.5w output power.

The Hydrofarm HORF8 clip-on fan comes in a 90° horizontal and 120° vertical oscillation range that you can use to direct the required airflow equal to what’s needed. You can also direct it to any of the directions by using a shaking rod for extensive coverage.

As a grower looking for a study fan that comes in a compact design, the ​Hydrofarm HORF8 is one of the best clip on fans and definitely ​the ​right option for grow tents. With its unique features, it’s designed to efficiently circulate air to keep the temperature and humidity in your grow tent at optimum levels.

Pros:

• 90° horizontal and 120° vertical oscillation range
• Easier control using the shake rod for wider oscillation ranges
• ​7.5w watts output power that makes it perfect for versatile ​use
• Minimal noise with a quiet fan operation
• Use of shake rod and other safety features that make it safe for both the user and plants ​
• Sturdy clip-on design that doesn’t slip down the pole while operating

Cons:

• ​Electrical connections could be better to stop issues such as abrupt stopping after some time of use

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6. SECRET JARDIN Monkey Fan 16W Fits 0.63″ – 0.83″ Inch Grow Tent Poles (2 Pack) – Best Value Pack

SALE


VIVOSUN 4 inch Inline Duct Fan 100 CFM, HVAC Exhaust Intake Fan, Low Noise…

• HOUSEHOLD APPLICATIONS: Help to boost airflow in HVAC units to remove…
• UPGRADED ADVANTAGES: Superior balanced Plastic blades for long service life…
• SPECS.: Diameter 4 inch, Speed 2930 RPM, Air Flow 100 CFM, Voltage…
• GROW ROOM APPLICATIONS: Used as intake fan to bring fresh air into grow…
• NOTE: Max Operating Temp of Motor is 130℃ / 266℉; Max Ambient Temp is…

Buy on Amazon

The SECRET JARDIN monkey fan comes as a 2-pack, in a sturdy construction and an engine that’s made up of 100% copper with no alloys. With features such as these, you are guaranteed durability for use in your grow tent. Also, with a sturdy build and blade construction, this monkey fan comes in pretty handy when keeping the temperature and humidity in the grow tent at optimum levels.

The SECRET JARDIN monkey fans measure 12 x 8 x 8 inches with a 5-pound weight and strong clips that can be mounted and attached to a pole in the grow tent. After identifying where you need the steady airflow in the grow tent, you can easily fix your fans on poles to direct ample airflow to your plants. Note that each fan can suitably fit on 0.63-0.83-inch poles.

This is an ideal value purchase with the 2 monkey fans that also come at an affordable price. By attaching the fans at different points in the grow tent, you can be sure to maintain steady air circulation. In addition, the SECRET JARDIN monkey fan comes with 16 watts of power to adequately cover a large area in your grow room.

So, if you are a grower who’s looking for value in a budget-friendly fan, this is an excellent fit that’s also conveniently easy to assemble without the need for an expert.

Pros:

• ​Light in weight so its easier to reposition in your grow tent​
• Comes as a 2-pack monkey fan
• ​Easy assembly
• User-friendly
• Sturdy adjustable clips that can be mounted on different diameter poles ranging between 0.63-0.83 inches
• ​Affordable grow tent fan​

Cons:

• Doesn’t oscillate
• 16 watts of power output is not strong enough for some grow tents with too much space

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7. Vivosun 4 Inch Inline Duct Fan- Best Budget Inline Fan

SALE


VIVOSUN 4 inch Inline Duct Fan 100 CFM, HVAC Exhaust Intake Fan, Low Noise…

• HOUSEHOLD APPLICATIONS: Help to boost airflow in HVAC units to remove…
• UPGRADED ADVANTAGES: Superior balanced Plastic blades for long service life…
• SPECS.: Diameter 4 inch, Speed 2930 RPM, Air Flow 100 CFM, Voltage…
• GROW ROOM APPLICATIONS: Used as intake fan to bring fresh air into grow…
• NOTE: Max Operating Temp of Motor is 130℃ / 266℉; Max Ambient Temp is…

Buy on Amazon

The Vivosun 4″ inline duct is a cult favorite budget option. It’s a simple inline duct fan that can also be used as an intake or exhaust fan. The 4-inch size means it’s compatible with the popularly used 4-inch duct tubes.

Check Our Recent Buying Guide about How to Hang Grow Lights From Ceiling- Explained in 6 Steps

Unlike other fans that are made of plastic, it’s entirely made of metal and runs at 2930 RPMs. It’s a reliable pick, so you can be guaranteed that there won’t be any speed or thermostat switches on it. In addition, it is quite light and requires little to no maintenance unless, of course, something gets caught in the fan blade.

It’s a small fan that’s built to move 100 cubic feet per minute of air and 12 watts of power output. For such a small fan that’s built to move this much air, it’s a reliably built budget pick that should be easy to use. However, note that it does have a maximum temperature of 266°, which shouldn’t be a problem for a regular grow tent.

The Vivosun inline duct also comes in a 6/8-inch version, but the 4-inch version is the most popular because it’s generally large enough to cater to most small-medium-sized grow tents.

Pros:

• Durable and simple all-metal design
• Small but powerful blow power that moves a lot of air
• Suitable for small-medium sized grow tents
• Easy to use and works reliably well
• Affordable inline duct fan

Cons:

• Needs to be connected to a power switch to be turned off

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8. PELONIS PFT30T2ABB-V –Best Budget Oscillating Fan


PELONIS Oscillating Table Air Circulation Fan, 12-Inch, Black

• COMPACT TABLE FAN: The PELONIS Table Air Circulation Fan has 3 speeds and a…
• SMALL BUT POWERFUL: PELONIS Table Fan Air Circulating design delivers an…
• INCREASE YOUR COMFORT: Using this table fan for air circulation in your…
• SAFE AND DURABLE: Built for long-term durability and safe use, this small…
• MANUFACTURER WARRANTY: Pelonis offers a 1-year manufacturer Warranty.

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For a budget pick, the Pelonis PFT30 is a pretty decent oscillating fan that comes in a simple 12-inch construction that can move a large volume of air for such a small fan. It was originally designed to be a table fan, but it can also be used as an oscillating fan that’s placed on the floor to move some of that hot air that settles down low in your grow tent and replace it with cooler air.

It’s surprisingly powerful for a small fan that just stands less than 19″. It has a 3-speed operation with minimal noise. Each of the 3 operating speeds has its button control. For a budget pick, the PELONIS PFT30T2ABB-V is a simple oscillating fan that also comes with sturdy construction that still requires care for durability.

Pros:

• Small but powerful fan that moves a lot of air
• Stands at less than 19″ tall so that it can fit almost anywhere
• Adjustable speed and tilt
• Comes with a 1-year warranty
• Relatively sturdy construction for a budget pick

Cons:

• Not as sturdy as the pricier options
• Doesn’t come with a wall-mount option

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9. Tjernlund M-6 Booster Fan- Best Inline Duct Booster Fan


10. VIVOSUN Clip-on Oscillating Fan

The VIVOSUN oscillating fan is a small but pretty good fan that will help keep the air moving in your grow room. It has two different speeds that let you choose how much of the circulation you need and whether you’ll want to have the fan stationary or oscillating in the grow tent. The head is adjustable, meaning it can be moved back and forth.

So the adjustable head feature and the fact that you can move the mount itself means that you can achieve almost 360° of movement all around the tent. It’s a versatile fan with multiple applications; for instance, it was also built for home use to keep you cool during that hot summer heat. It’s not the most powerful product for house use, but it’s definitely much better as a grow room fan than it is for use in the house.

Pros:

• Easily clipped on
• Versatile use
• Affordable
• Gives you options such as leaving it stationary or oscillating
• Small and light making it portable
• Adjustable head and movable mount to achieve almost 360° range of movement

Cons:

• Burns out quick if left to run for long

Check Amazon Price

How to Select the Best Grow Tent Fan for Your Plants?

A) Is It Noisy?

Deciding on the best fan for your grow room also requires considering how much noise you can handle and whether it’s co-habitable, especially if you have neighbors. Of course, there are a couple of reasons that favor having a quiet or low noise fan.

The first reason would be the fact that you don’t want some loud, endless humming going on in your house every other time. The other reason would probably be the fact that while growing some plants, such as cannabis plants, is becoming more common, many people still prefer to maintain some level of discretion in this.

B) What’s the Size of Your Grow Tent?

You may need either one tiny fan, or a whole bunch of small fans, or exhaust fans, depending on the size of the grower room you’re operating from, the number of plants you may have, and the type of plants you’re growing. For instance, growing cannabis plants need a particular fan performance and a fan with features such as a carbon filter.

Mostly, it’s the size of the operation that dictates just how much you will need to spend on the fan. For example, having many plants might need you to spend more on good quality fans that will help keep the temperature controlled and help create enough ventilation. However, if you just have one or a few plants, there’s no need to get anything more than a tiny desk fan that you can mount from above it, looking down on it.

C) Does It Also Come With A Warranty?

Like any gadget, it’s always advised that look into the warranties that come with the product, even if it’s a product that you got at a low price. Additionally, it’s also best to look into the brand reputation and after-sale services, such as the customer service team you might also have to deal with. Some reputable companies even offer refunds and actually seem to care more about their customers since they’re always prompt in helping.

Other Things to Keep An Eye On

Throughout the entire article, we’ve crafted this entire note on how long to leave the fan on plants. But there is no rule of thumb in this case. Instead, it depends on a few other factors such as:

a) How Powerful The Fan Is?

You can’t run just any random fan 24/7 just because it looks cool. Too much energetic air movement may backfire and induce branch breakage or stem.

b) Is The CO2 Scrubber Stopped for A Long Time?

CO2 filters do play a role that’s mandatory for the plants. And technically, when air intake/extraction is stopped, CO2 also stops working. Sometimes, it may bring on the troublesome situation when you keep the extract fans off for a few hours.

1. Occupy the fan that provides the exact airflow you need.
2. Use a fan controller to set the fans’ speeds as you want.
3. Never keep the fans off for a few hours in a stretch.

[Ratch33]

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[Deanroche]

Great posts and links @Ratch33 , so much information

[Ratch33]

Always happy to try n help my fellow tokers!! My people!! Cheers

• Check these parameters aswell!

• Maximizing Yields - With Dr Bugbee

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[Ashton586]

Thanks for the info! Anyone run into the same problem?

[Ratch33]

If you constantly have high humidity, you can prevent mildews, pest, disease by exfoliating with a shot apple cider vinegar mixed with about 500ml of water ( Spray bottom & Tops of leaves as well as the stems… Also lollipopping the bottom stems will ensure good air movement. Place a fan to gently blow across the pots/bags.

NOTE: When spraying your plants remember to cover your medium & dont let the applle cider run in your medium!! This will drop the ph significantly. “Light Spray”

[Snow]

Welcome I can’t say good enough things abouts this community it’s absolutely the best one I’ve tried a couple apps when I got here I hadn’t grown anything since elementary school science class I did my research came here and got way more info in 48 hrs than I did in a week on Google I feel like when someone can offer some input and has a constant ability to upload progress it’s much easier to find out what works for you and what you find more problematic example quickly I was doing a lst (light stress technique) worked well but I later found out about scrogs and sea of green now I’m working on how to top a plant to get the number of colas I want specific and teach them to grown in a specific pattern you’ll see alot of people do this by nature it’s alot more work but for now I’m simply scroging and gonna tie branches to spread them my current grow is kinda an experiment ATM so I didn’t let them veg long at all just trying to get a quick study in

[Stoney1BudTokie]

@Ratch33

SECRET JARDIN Monkey Fan

I’ve got one of these in my tent SECRET JARDIN Monkey Fan

[sentenza]

Welcome Madd,

I’m also new to Indoor and just had a successful harvest with two other plants in flowering…

Looking at the photo you posted, I have a suggestion: Change your pots! It turns out that your plants get most of their air through roots, so you must ideally not use a fully sealed pot. In a sealed pot, roots will grow all around your compound looking for air and this will greatly limit the nutrient intake.

To solve this, you can find plastic pots with holes on the whole periphery that keep water inside but let air in, or you can also find grow bags that have the same property. This will ensure a regular and dense root network and proper air (Oxygen) intake for your plants.

Also one thing that is really important is the PH when you water: check and correct each and every time, feed slowly in small steps and better not enough than too much.

With this and all the good advices already posted by @Ratch33 , your babies will grow to their full potential

Enjoy!

[sentenza]

Looks good Snow!

With topping, you’ll get a wider canopy. Here is my first attempt below, just before flowering:

You should also have a look at your pots… See my post above.

Also your leaves show a bit of an issue with nutrients, likely potassium defficiency… See Please help me identify this defficiency

[Snow]

No thats a burn I was feeding both plants difrently I was experimenting with feeding to see how much more growth you’d get outta heavy feeds

[sentenza]

Indeed, that’s a good explanation

Here is a fresh pictures with topping, 2 weeks in flowering/stretch

[sentenza]

Hi everyone,

Here a fresh picture of my two babies… Still 4-5 weeks to go, but I really think this topping thing works

Note: these are feminized seeds… Don’t try topping on auto flowering seeds

[Graywave]

That’s a lot of colas, nice job they’re looking great

[Madd888]

How awesome!! Good luck!! My ladies are finally in flowering…they all seem to be doing great and budding well…i just hope I’m doing it right…

[Madd888]

How heavy were you feeding and how many times if you doont mind me asking…I was running tests on mine and seems like when I use foxfarm aqua soil I dont need any at all…and i tried my own compost as well and that actually had too much of something and caused my plant to stay light green the whole way through…I might just stick with the aqua and do molasses but still want to try other ways…

[lin_diesel]

Thanks @Madd888. Post an updated pic of your ladies. My ladies are on day 27 of flower starting to thicken up.

[BigWorm]

Looking Really Good!!! @lin_diesel