Ventilation and carbon air scrubber

Hello! Does anyone have experience using AeroScrog Carbon Air Filter Scrubber? Carbon Air Filter Scrubber Hydroponic Grow Light Odors - (eBay item 160113833700 end time Oct-31-07 19:02:41 PDT) $60 for the unit seems good, but is 80 effective CFM enough for a 25' cubic foot cab?

Thanks!

This is a link on how to make a pretty cheap and easy carbon scrubber. Haven't made one myself, but the general idea is all you need and you can make one custom for your application. I'm going to try and scale this down, make it 4" outer diam 2" inner and pull air through it with a pc fan I have. My box is only 2X1X3
http://boards.cannabis.com/growroom-...on-filter.html

Thanks for the link! I'll see if I'm not too lazy ;)