Originally Posted by mr.homola

well I'am not an expert,I actually got quite hot growdrobe myself (26-29C) but I don't have a problems with heat stress. I've put my fan in to the chimney and it's sucking air from in out. The inlet is close to light bulb and I grow with my doors closed all the time as it is all fitted in kitchen. And what I think is a good thin is that when it gets smelly, it will come out from house. So to avoid neighbours smelling anythig I've put an carbon filter on the oher side of fan. I think it's working ok. Yeah, and to get some air in when you close the door, I dril set of holes to bottom of cupboard. That actualy dropped a temperature by 2-3C.
hope it helps