hey stinkyattic i got another problem haha. it looks as though i wont be able to use a 6" exhaust out my vent so im stuck with the question of either buying a 6" inline fan W a fast filter, then have to reduce it to a 4". OR ive calculated the cubic feet in my room to 100 cubic feet. from the specs i have looked at for the vortex 4" inline with a fast filter is would accomidate the 100 cubic ft. in your opinion would you go with the 4" or the 6 " and also thanks for the help as always