What pipe to use for bathroom exhaust fan?

Mitchell Pfannerstill asked a question: What pipe to use for bathroom exhaust fan?
Asked By: Mitchell Pfannerstill
Date created: Mon, Mar 29, 2021 8:24 AM



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❔ What diameter is a bathroom exhaust fan vent pipe?

Bottom line: a 4-inch exhaust duct diameter is perfectly permissible and will work fine as long as the CFM rate of the fan OR the length of duct run (including effects of elbows or bends) does not exceed what the manufacturer recommends. In those cases a larger duct may be the solution.

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We usually spec 4" sched. 20 PVC pipe as it comes in longer lengths than 4" metal does around here, though elbows can be tough to source sometimes. Unfortunately most contractors / HVAC guys will use flexible corrugated hose because it's cheap and fast. If it's a luxury project they'll splurge for the flex aluminum instead of the plastic kind.

Condensation can be a problem in an uninsulated attic, so the Homeowners & Trades Resource Center recommends installing rigid pipe with a minimum slope of 1/8 inch per foot toward the vent outlet to keep water away from the fan.

Regarding this, what kind of pipe do you use for a bathroom fan? Use rigid metal ducting (aluminum or galvanized steel) with lengthwise seams facing up and joints sealed with foil tape or duct mastic, or rigid plastic pipe. Be sure to slope the duct a bit for drainage to the exterior. Thereof, Do exhaust fans need to be ducted?

They will have to be transitioned from 3″ to 4″ exhaust pipe. The hard part is no hardware or home improvement store carries an offset 4″ to 3″ reducer and there is usually no clearance between the exhaust vent exit and the ceiling sheet rock. Use a short piece of 3″ pipe to get away from the exhaust fan and an elbow.

You will want to use a semi rigid metal flexible duct like this - Speedi-Products 4 in. x 96 in. Heavy Duty UL 2158A Flexible Round Aluminum Transition Pipe-EX-MTF 496 - The Home Depot You may need a reducing collar depending on the size outlet for your fan and the vent cover where it exits the building.

Also to know is, what kind of pipe do you use for a bathroom fan? Use rigid metal ducting (aluminum or galvanized steel) with lengthwise seams facing up and joints sealed with foil tape or duct mastic, or rigid plastic pipe. Be sure to slope the duct a bit for drainage to the exterior.

Our bath vent fan duct installation photo shows use of solid metal 4" ductwork conducting the fan exhaust to an outdoor soffit under a cathedral ceiling roof. Following the sloping roof/ceiling and exiting into the soffit, this fan vent duct slopes down away from the vent fan which you can just see in the photo upper right corner.

A. Yes. Otherwise the exhaust duct gets too cold when it runs through the attic. A cold duct allows condensation of moist indoor air, leading to drips from the exhaust fan. Q. Is there any particular type of piping to be used through the attic (metal ductwork, PVC, etc.)? A. You can use round galvanized ductwork or PVC sewer pipe. Q.

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