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Most bathrooms (at least in offices) have dedicated supplies and returns and it’s usually has a pressure differential to suck the smell out. At least that’s how most in the US are. I’ve seen it vary around the world.
Why cold air…?
Most bathrooms (at least in offices) have dedicated supplies and returns and it’s usually has a pressure differential to suck the smell out. At least that’s how most in the US are. I’ve seen it vary around the world.