Installing Bathroom Fan Vent Through Soffit

Idea 5 connecting the duct to the bathroom fan.

Installing bathroom fan vent through soffit.

Even though the exhausting bathroom fan may disrupt the intake air flow of soffit venting it is a very small area and isn t going to be a big problem. Note that the bathroom vent fan must always exhaust to the outdoors. Next we must slip a worm drive metal clamp on the inside part of duct liner. In this particular installation tom ran the exhaust duct into the attic and through a sidewall to the outdoors.

I have gotten mixed opinions on whether to vent the new fan through the roof or through the soffit eave. Check the damper and the screen in prior to installation. A down through soffit exhaust vent design by leaving warm air in the exhaust duct when the fan is off creates a heat trap that reduces heat loss out of the bathroom through the exhaust fan duct when the fan is off in comparison with up routed vents or even horizontal vents through a gable end wall. How to install a bathroom fan vent in the soffit.

We explain how to install bathroom exhaust fans or vents the vent ducting the vent termination at the wall soffit or roof vent fan wiring bath vent duct insulation bath vent lengths clearances routing and we answer just about any other bathroom ventilation design or installation question you may have. This way we can make sure both are positioned properly. Never allow the duct to simply blow into an attic crawlspace or. Other venting options includes running the duct up through the roof or down through the soffit.

The roof contractor recommends the soffit to minimize protrusions through the roof. If you need to install a new duct for venting your bathroom exhaust through the soffit then you should verify the duct size used with your bathroom fan. Many old bathroom fans still use the small duct sizes of 3. If your bathroom fan is high powered it may use large duct sizes like 4 or 6.