I'd have to cut a hole in the wall, to run it outside. My grow is a one room structure. The room is divided by a false wall. The grow area is insulated and pretty well sealed, the other half of the room pretty much runs to ambient outside temperatures and humidity. I could drill a hole and run the intake hose on the other side of the false wall. I think I'll try running it up toward the ceiling 1st. Also wondering if the air pump hose intake will act as a muffler and quiet the pump down some.Run the aerator intake outside room up high for best results then you know there's no chance of cross contamination