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So when I switch on the Living room unit, I can feel that it blows out air in the opening at the bottom. It has 2 vents on the outside. The bedroom units have 1 exterior vent. I guess I could just unscrew the unit cover to see what's inside, but I'm sure that I've seen these in other people's...

Hello everyone! I own a house built around 1960 and it has these ventilation boxes on the wall. A larger one in the living room, which is wired into the mains (see 1st pic below). And then 3 smaller units in the bedrooms that are mounted higher up and don't have any wires or switches (see 2nd...