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Thread: Size of bath ceiling exhaust fan duct
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Old 11-18-2020, 07:11 AM
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Originally Posted by kathyspear View Post
We have a Lantana and I want to replace the exhaust fans in two bathrooms. Would our 20 year old home have 4" ducts? Or does the existing fan have to be removed to find out if I need 4 or 6" Thanks in advance (and sorry for hijacking the thread).

kathy
Your ducts would be 4 inches same as the dryer vent.