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You can make a zipper door with sticker zippers. They sell them at home depot. They are 8 feet long and under $10.

Thanks Bud, yes the lights are air cooled. I gues I'll be needing a timer to connect the co2 and exhust fan. My friend owns a "Producer" by BC Northern lights and the co2 comes on when both fans are flowing. The exhust fans run even when the lights turn off...and the box works great. My friend...

Hello everyone, great forum you have here...I'm hoping someone can help me out with my question, I'd really appreciate it! My friend is trying to figure out how much CFM fan is needed for a 5 x 5 x 7.5 (Total 187.5 cubic feet) room. A thermostat does not control the fans. The exhaust fan is...