You should get a temp/humidity tester for your box and try to keep temps 60-80 and humidity 50-70. The fan being on will lower both these values.
medicinegivers Reviewed by medicinegivers on . fANS,,how long to run them Well my box is 2'x3x3 I will have a pc fan bringing air in and a pc fan blowing out through a carbon filter, and a small seprate fan blowing on the plants. My question is do the pc fans that move air in and out of the box run all the time, these fans will also be cooling the box , lights on 24/7. Does the fan thats blowing on the plants run all the time or does it need to be on a timer. Thank for loking.:) Rating: 5