think about it this way, for cost of several jars of ona you can buy a 4" carbon scrubber & fan combo on ebay get maybe an open-box deal or something for approx 60-75$ maybe even cheaper, I think I paid like 85 for my 6" that was open box deal that way you can get a good inline fan that is low noise as well. Even brand new I doubt a 4" scrubber combo would cost 100$ probably less, a 6" I know you can find on there for like 100-125$... actually the 4" carbon filters sell for about 20-25$ new, then you just need 4" fan even a cheapy 4" inline fan will work, that you can easily get for under 20$ as well, then need router like 15$ & some 4" ducting 10$, thats pretty cheap setup for your safety and will work just fine. Personally I'd go with with a decent inline fan, since them run a lot and are known to make some noise, ventech is good thats what I use, I have also used ipower filters. power consumption is low on 4" inline fan probably 50w or so, My 6" is 125w