Exhaust Fan Into Roof Cavity

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Exhaust fan into roof cavity.

The bath exhaust vent duct is routed through the ceiling between i trusses used to support the roof over the wall top to the building exterior into the soffit cavity. The rangehood is perhaps only 5 7 years old. I m no master builder but i do not see any signs of mold or rotting in the ceiling at all and when we purchased the property 3 years ago the building inspector explicitly stated that. A ceiling exhaust fan is one of the most popular methods of ventilating a room.

Am i missunderstanding that you are thinking of blowing the exhaust air into a 100mm cavity between the ceiling and the roof. Of course it s unusual for a roof to have no existing ventilation. In no case is it acceptable to just dump any exhaust fan directly into an attic. Bathroom exhausts are commonly ducted to the outside however many people decide to simply exhaust into a roof space or cavity.

I would say that the bathroom exhaust fans are original or close to original to the house which is mid 1970 s. Intake vents located at the lowest part of the roof under the eaves allow cool air to enter the attic. The location of bathroom exhaust fans can also determine how effectively the fan operates. It can quickly remove a larger volume of hot and or humid air from your attic when compared to static ventilation.

On 2020 02 26 by anonymous. This in turn can help save money on your heating and cooling costs. The fan draws in fresh air from the lower vents pushing the warmest air highest in the roof out through the high vents. Hot air exhaust vents located at the peak of the roof allow hot air to escape.

This means that there s been 40 years of venting into the ceiling cavity. Those ceiling vents are fine to vent off into the roof space i think the recommendations for a bathroom is 50litres per sec which u will roughly get from a ceiling fan. This includes two bathroom exhaust fans and the range hood in the kitchen. It needs to exhaust to the exterior.

These fans expel air upwards through the ceiling and can be exhausted into the roof cavity or ducted to be exhausted outside. It could also lead to problems with moisture in the roof cavity. A ceiling exhaust fan as the name suggests is an exhaust fan that is mounted on a ceiling. It s important to make a thorough assessment of the existing spaces where air may enter and exit the roof cavity.

When connecting a bathroom fans to ducting consideration needs to be given as the length of duct will sometimes impact air capacity especially on bathroom exhaust fans with smaller capacities. Anon if i understand your original question you have a bath exhaust that is discharging into a roof cavity or space not to outside.