I use axial fans exclusively...most CFM for your buck, low low electrical usage, and they seem to last forever. 5 years on the same fans, no failures at all. You DO have to clean them every once in a while. A dirty fan blade only moves HALF the air it's rated!!! ( Even more true on squirrel cage type blowers) Fans are always on...lights? It don't matter to them plants one bit if you run them 24/7 but you're electric bill will be lower with 18/6. Regardless of light schedule always run your fans, and vent or heat as needed to maintain 78 degrees...Humidity is a far far secondary concern and not critical. They will grow at 60F, but very slowly. Read sticky's!
TANKJR Reviewed by TANKJR 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