I have a question about the noise coming from the bathroom exhaust in a senior citizen apartment complex, I generally do the yard work at one that is close to where I work and at times the nurses ask if I can help with tasks inside the building, 3 or 4 exhaust or vent ducts have louder noise coming from them, while the other bathrooms are much quieter, I took one cover off and all I saw was like a heater duct with no fan, there are two in each bathroom, I assume one is exhaust and one is return, there is one larger square and one that is shaped like a furnace duct in each bathroom. Trying to figure out where the excessive noise is coming from in some and not in other rooms?
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