Fans On or Off during Lights Out??

[Pass That Shit]

I have my regular fan off right now for the current 12hr dark period with no holes in the room. I'm sure the room is not air tight though. If you have fan holes that allow air into your room and your plants are not showing signs of suffering, I think you're probably ok. One would think that the plant needs air even when the lights are off since the plant is alive. Actually, I've noticed alot of growth after the dark period, so the plants are still alive and growing in the dark.

I didn't drill any holes to install intake/exhaust fans because I didn't want to bring cold air into the room and then have to turn on the heater to bring it back up. I have been experimenting with the regular fan off since the temps are already down during the dark period. So far so good. But my plants are not in a box, they are in a room. I already bought the inline fans and the flexible tubing, but I'm trying to get away without making the holes. Like I said, I think the only way you will know for sure is by trying it, or by taking a reading to make sure that the plants have air to breathe during the dark in your box. My plants have been in a room without any holes during the dark period for about a week now. I open the door for fresh air when the light is on.

[razzapiggy]

I am curious about this as well. I have a six inch vortex that blows my air through a carbon filter. My night time temps are super low and I just bought a space heater. Obviously having the room flushed of its air all the time is a bit counter productive to trying to heat the damn thing! I am considering turning the fan off for 10 mins every half hour so the heat will be used more effeciently. Or would it be better to do 20 mins off-->40 mins on type thing?

[Perp]

Exhaust should run 24/7 (if not running co2) for the following reason:

Cool air holds less moisture than warm air so when the lights go off the moisture will condense and cause dew, especially right after watering. Dew covering your walls and windows and equipment is generally not good but is especially bad for big flowering buds for obvious reasons.

Running your exhaust at night constantly vents the humid air out of the room.