I have same exact problem, did you ever figure this out?
My grow is much smaller, only 1.5 x 2 feet and 6 feet vertical but same principle applies.

Would love to know how you got past the issue of the fan drawing all your dry air out.

Thanks.
Bulster Reviewed by Bulster on . Humidity Question Just got my humidity therm. hooked up, it reads 66 but the problem is it's not right where the canopy of the plants are. I see no signs of fungus at all, but am considering buying a dehumidifer as a precautionary measure. Question is... if my humidity is at 66 a few hours into their "day" what does it get up to at night? Should I be concerned? I also only have one occilating fan going right now, perhaps I should buy another. Some people reccomend using a heater during the night cycle, Rating: 5