an how many of u suck air thru ur carbon filters and how many blow air.......i hooke mine up yesterday and the fan was to powerfull filter was old somthin cause my 8 inch fan pulled alot of fine sand like carbon from the filter and its all over in my hoods etc when i turned on my fan hoods looked like a black sand storm was going on just blacked out,,,,guy at the hydro store i talk to said i can try blowing air thru instead of sucking air and that will stop carbon from getting to lights and stuff makes sense