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Exhausting 2 baths with 6″ ducting through one 4″ soffit vent

Otosan | Posted in General Questions on

Will I get too much back pressure if I try to exhaust two bathrooms with a 200 cfm fan using 6 in ducting but terminating in a 4″ soffit vent or roof jack?

I ask because while it’s easy to find a 6″ roof jack, it’s not so easy to find a suitable 6″ soffit vent.

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