So my girls have been giving off their sweet sensual perfume for days now, and I know I should have done this sooner... but here is my DIY carbon filter..Picked up a few things at walmart.Black duck-tapeBlack "Pencil cup"Smaller black "Pencil cup"Black ladies socks (pantyhose)Activated carbonPoor some carbon in the mesh like "pencil cup".... just enough so the smaller cup is level with the larger cup.Slip the smaller cup into the sockTuck the sock into the smaller cup holding the end of the sock. Pore in the carbon.. keep holding the end of the sock.Now pull on the end of the sock and use your finger to guide the carbon into the space between both cups until filled.Now pull the end of the sock over the entire filter.. twist the end of the sock at the bottom and pull it up over the end of the cup.Now simply use duck-tape to place the filter over your exhaust fan. I used a rubber band to secure it...Works great... though I already miss that sweet aroma =[