Installing Bathroom Fan Vent Through Soffit

Remove the tape from the fan first.

Installing bathroom fan vent through 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. Note that the bathroom vent fan must always exhaust to the outdoors. The roof contractor recommends the soffit to minimize protrusions through the roof. Installing a bathroom exhaust fan to the soffit can likely be done within an hour or two if you have all of the tools such as the vent cover a tall ladder the vent hose vent clamp and jig saw.

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. 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. Idea 5 connecting the duct to the 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. 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. 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. Other venting options includes running the duct up through the roof or down through the soffit. This way we can make sure both are positioned properly. 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.