Air intake / exhaust design

I've found with negative pressure the doors freeze shut to the ops in the winter. This is why I keep an equal or very slight positive pressure. This also avoids outside drafting entering into the grow-op through poorly insulated areas causing cool spots in the grow area. I keep an unchopped piece of firewood handy to break the ice around the door in the event of the ventilation screwing up.

bird mcbride said:

In times of no practical intake filter available we've resorted to using womens stockings/pantyhose material for intake screens.

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Your speakin my language bird. If people could see what I get from what I use, they'd shit. I'm all about simple/reliable/inexpensive.

bird mcbride said:

I've found with negative pressure the doors freeze shut to the ops in the winter. This is why I keep an equal or very slight positive pressure. This also avoids outside drafting entering into the grow-op through poorly insulated areas causing cool spots in the grow area. I keep an unchopped piece of firewood handy to break the ice around the door in the event of the ventilation screwing up.

Click to expand...

I'm inside so not an issue here luckily. Since I'll have a 2x4 construction I've thought of throwing in some cheap insulation, but I don't think it will be an issue and suspect this would be overboard. My father has some zip system flashing tape I'll probably use to get it air tight. My goal here is to make the whole thing as air tight as possible to be as efficient as possible with my exhausting and passive intake system. You guys have helped me keep it on the right track.

Many thanks.