Quote Originally Posted by mountainman
Plywood Fart Fan?
I think it's a piece of plywood, with a fart fan in the middle... blowing air towards the bottom...

Zandor, how much CFMs the fart fan? I see a lot the 50CFM (square), the 90CFM (6" circular) and the 300CFM (squirrel cage). What do you run?

In addition, question:::
Your carbon air scrubber is in, say, an "open" system... it takes air from the room, and sends it back into the room... right? The other option I see is that the filter is mounted on the exhaust... so, only when you exhaust do you filter the air...