Exhaust fans, who's your favorite? are any light leak proof?

im looking for exhaust fans for my facility. its a sealed grow but we need to have exhaust for co2 per the city code. who do you think is doing the best job with dependable exhaust fans? also curious is anyone is finding light proof exhaust fans? that aren’t gigantic lol. the smallest ones I can find are 36". id like something more discreet. thanks for any input! happy growing.

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I have a few suppliers I can plug you with, @vinny. Send me a DM if you are interested and I can give you some names and numbers.