Should i go with a 4inch or 6 inch system for a 36x36x73 tent ?
Sorry for all the posts yaw have seen from me 
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Six inch
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Yep, 6 inch.
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I have a 10x10 tent with a 8” carbon filter exhaust, thinking about adding a second one with only one outtake fan, do y’all think it’s over kill?
Meant with only 1 intake fan
6inch is the way to go my friend happy growing
I have a 3x3 and went with a 4".
I would get the 6" for sure. I will be swapping out as soon as this one quits.
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I like to go bigger and it works less hard and gives you that extra in case you need it. I use an AC infinity exhaust, and love it, and its DC so its electrical draw is negligible
More exhaust the better
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Determine how much CFM you’d like to move. Is it an exhaust or intake as well? Exhaust will need to be higher CFM than an intake. A 3’x3’x6’(relative)=54 cubic feet of space (give or take with the amount of equipment,plant size, etc.).
If you can exchange the air in said space 3 times per minute you are in a decent range.
54x3=162 CFM air volume. Don’t forget to factor in any hoses that may be connected and any 90 degree/45 degree/etc. bends in said piping. Those will cut down on the amount of volume able to flow through.