What would be your minimum lights off and lights on temps?Hushpuppy said:It doesn't have to run all the time but many people who draw their exhaust air from within the grow space will run them constantly so that they draw fresh air into the space all the time. This can be an issue if your space is drawing air in from the cold outside air. While the lights are off, if the air coming in is cold then the room will get too cold. I have this issue and actually have my inlet air coming in by my heaters which warm it as it comes in.
the more fresh air that you can exchange in the room the better---yes, they will grow bigger, faster, and healthierjuniorgrower said:Thanks for the quick responses. If I run it all the time will it help my plants flower faster and bigger?
No, running the fan all the time will not help your plants grow faster or bigger. I do not believe that there is any benefit to running an exhaust fan while the lights are not on. The plants need a continual supply of fresh air all the time the lights are on for proper photosynthesis. I run a small bathroom type fan mounted near the ceiling to help maintain temps, but I do not run my large exhaust fan 24/7.juniorgrower said:Thanks for the quick responses. If I run it all the time will it help my plants flower faster and bigger?
That depends on your situation. Your temps are OK... Anything over a 15 degree change between Lights on/off will cause slow growth. Hushpuppy is right on, 70-75 is just about optimal in most cases.juniorgrower said:Does the exhaust fan need to be running when my lights are off?
jonath4n said:I'm with THG, I don't run my fan 24/7 either.. I'm not sure how low my temp gets with lights off, but with lights on they are 76-78F, with exhaust fan on 70F (still lights on). I'm probably going to have to add another heater in the room. or is 70 substantial enough for adequate growth?
Hushpuppy said:Once again THG gets me on something I had not considered when I answered the air on question. Yeah the plants don't need the fresh air as much(if at all) during the dark period as they don't use co2 during the dark period. I do agree that I like to have the air flowing periodically to maintain humidi