I saw a DIY scrubber over at IC that uses the Panasonic WhisperLine fans.
International Cannagraphic Magazine Forums - Panasonic Whisper Fan Carbon Scrubber Tutorial: Quietest most efficient fan ever!

I think I might invest in one and make a scrubber/exhaust with it like that guy did. I'm building my own desk right now so I can learn to build furnature type things, then I am going to build a cabinet for my grow and I will probably measure out a completed carbon scrubber and build a little section just for that.
Dr.Hashman Reviewed by Dr.Hashman on . Duct fans I was wondering if anyone has used duct fans to power their exhaust. I am hoping to get one to put inbetween my growspace and my carbon filter. Does anyone have any tips or suggestions? Duct Diameter:.................... 4" Unit Weight:....................... 2.50 Lbs. Max Boosted CFM:............. 80 Free Air CFM:..................... 65 Amps:................................ 0.30 Housing Length:.................. 6" dBA:.................................. Rating: 5