Grow tent advice

Ok, so question. I am aiming for a .8vpd for my seedlings. 77F, 70%RH. When the Niwa senses the temp threshold it turns on the inline fan and thusly the RH and Temp go down.

Obviously once flower starts I’ll run the in-line fan constantly but is it necessary to do so the entire grow?

Equipment used…
4x4 tent
Humidifier, tower heater, dehumidifier and 300 watt Mars Hydro TSW2000 LED night, 6” in-line fan, one stationary and one oscillating fan.
All managed by a Niwa.