So what if if exhaust is 6" and you have a passive 4" as well as another ceiling exhaust but for emergency so its passive as well unless its on but I attached it to the side of the grow room, but my room is a room within a room, basically a bedroom but with a floating wall I built. the only true intake in my room is a furnace vent its, 6"
my temps get up to 30, most stay around 25-28.5c 1000watt hid and am about to add another too !!! so I think I will be running into problems in the near future, its a new setup so, I have allot of ironing to do yet !
<----vent>hose>inlinefan>hose>aircooledlight>hose>can filter<-----6" <----- 4" air intake x2, 1 passive or manual <------ 6" air intake passive or manual