What is this and can I exhaust out of it?

Lol I’m high, disregard previous post. You should be able to, I would still use a backdraft dampener to prevent any backflow into your grow area, your basement or furnace room, etc… I didn’t take any classes or anything like that but I was a HVAV installer for about 5 years back when I was a teenager, I have done a few side jobs here and there but never got any certificates… Incase your wondering if I have any experience with ducting!

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