Fan and ventilation

my question is this . i have a small grow room 6’ by 5’ . i am growing in soil and i have the lights set at 18hrs on and 6hrs off . i have the fan on the whole time the lights are on . what i want to know is should i have the fan on while the lights are off ? right now i have the fan on for 4hrs and off for 2hrs during the dark cycle. is this ok ?

You should run a fan 24 hours a day to circulate air. It is also a good idea to have an exhaust system that works to keep temperature, and humidity down.

thanks for the info !