months ago i bought a 300 x 800 sok...connected it up to the fan to try it out but had probs with it being too noisy ...then grow plans changed(didnt move house) ...and where i was growing the fans was way to noisy....so i never got to use it realy...the otherday thought i'd ask at the hydro shop about getting my fan noise down ...and mentioned i would be using the sok(bought from them)...the guy pointed to the corner and over and over said bring it back....a pile of the soks where there that had been returned and they wernt selling them no more...ppl had too many issues with them and humid grow areas and smell not being covered up at all...said if i add $60 more i'd get myself a carbon filter...wich is what i was going to buy in the 1st place and got talked into the sok...grrrrrr....but now i find i need neither due not to have a grow anymore and probly never to be growing again?... just getting a refund now so worked out in the end i guess.HH. =]-~