I thought I'd post these handy little helpers. I've made several different carbon scrubbers using inline duct fans and box/window fans with these pads and I must say they work marvelously. I can't attest to how long they will last, but you can bet that how you apply and utilize these pads will make a difference in longevity.
Anyway, maybe someone else can squeeze some use of these
http://www.google.com/m/products/detail?oe=UTF-8&source=gp2&client=safari&q=hbh+cut+to+fit+carbon+filter&channel=products&hl=en&cid=8943573246772219969
Anyway, maybe someone else can squeeze some use of these
http://www.google.com/m/products/detail?oe=UTF-8&source=gp2&client=safari&q=hbh+cut+to+fit+carbon+filter&channel=products&hl=en&cid=8943573246772219969