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Ceiling vents in mfg homes

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Sometimes I see ceiling registers, in manufactured homes, in all the rooms in addition to the floor registers for the furnace. In the hallway there will be some ceiling registers too. Next to one of the hall ones there will be a fan behind a register. They don't come on when the heater is on. What are they for?

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..........in the late 80's and early 90's a number of brands were using small fans as part of an effort at fresh-air introduction. The concept was driven by the formaldehyde off-gassing issues within the industry. I've seen fans located in rooftop vents, similar to bathroom exhausts, that the owner never knew existed 'til they heard funny noises when the fan began to fail/squeak. Not one of the industry's better ideas[:-paperba...........Greg

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