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Exhaust fans in laundry rooms are usually required when there is no exterior window in the room and the dryer to be used heats with gas power. Why? To exhaust the CO2 CO2 in large amounts is hazardous to humans and can cause asphyxiation/death.


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In rooms with no shower or bath, 25' should be no problem. Just run the smooth wall pipe and go with 4" diameter. For the rooms with showers and baths it should not be a problem if you can get it go vertical into the attic, then slope down towards the exit. Even at 25' it should not be a problem. You could even possibly use ABS pipe for the sloped run ...



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