Moved into a condo and noticed a whistle coming from the door. This seems to be pretty consistent with many buildings I’ve been in and interested to know why.
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I don’t think this is common. The air pressure have to do with air vents, air conditioning, or heat making higher pressure in the hall area. It also would have the advantage of keeping outside air from blasting in, an advantage in dirty cities. It made me laugh to think it is like a lab with negative pressure to keep your apartment germs and stink in and outside building air out.
This has to do in the event of a fire. It will keep smoke in the unit that’s on fire keeping the hallway as clear of smoke as possible for evacuation. You likely have a heat sensor in your unit that’s attached to the building’s fire alarm system. Google heat detector for fire alarms and you can see what they look like. Basically in apartments and condo buildings you have the smoke detector in your unit that’s for the purposes of letting you know you have something burning in your unit, and that heat detector for when it becomes a threat to the building.
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