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The bathrooms in our new(ish) place have what look to be regular exhausts on the ceiling. There’s a switch on the wall. But it seems obvious they don’t work. It stays steamy in there, and there is no noise whatsoever. I contacted the previous owner to inquire, and she said they are “silent gravity exhausts” and that they definitely do work. She said you keep the switch on and then they just do their thing when they sense pressure?? I tried holding a piece of tissue next to them after a shower and I saw no suction whatsoever… Anyone know about these?? And who do I call to have them looked at/fixed?? Thx!