Venting A Bathroom Exhaust Fan Through Soffit

If you are also amongst the people who are interested in avoiding making a hole in the roof and get the deed done using a soffit you have come to the right place.

Venting a bathroom exhaust fan through soffit. Dips and bend in the vent hose also cause the water to accumulate in the low parts due to condensation. I would love to see a copy of the building code that suggests venting a bathroom fan through the soffit is recommended. If you vent through a soffit where attic vents are often located the moisture will get sucked back up into the attic or roof venting. And as someone else pointed out make sure the fan is powerful enough to do the job.

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. A soffit exhaust vent cover is installed in a straight line as much as possible from the bathroom exhaust fan. One is to route it over to a soffit vent and attach it to the back of the soffit vent but this can work against your exhaust fan because that s actually an air intake so not as good as other methods. Just make sure that there is a slight slope to the outside so and condensation in the duct will end up outside.

You should try to install the soffit exhaust vent cover in a straight line from the bathroom exhaust fan as much as possible. If there are bends or dips then that means the moisture in the air can accumulate in those low parts from condensation. Fewer bends and turns in the soffit exhaust result in better airflow. Longer runs require more power.

The alternative to a roof exhaust if you re concerned about not being able to seal the hole in the roof is to exhaust through a gable end. Opposed to the traditional practices of venting a bathroom fan through a side wall or roof you can also vent it through a soffit which is much preferable in some cases as we will see in this article.