Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic.
Bathroom exhaust fan hose attic.
Bathroom code does address the issue of moving odor and moisture laden air from the bathroom to the outside.
Ceiling fans vent either into the attic or outside through the roof.
Draw a mark on the bathroom ceiling where you d like to install the vent fan.
Through the roof or an exterior gable wall.
Surprisingly bathroom fans are not required by some building codes.
It is because of this that many builders tend to advise against this method.
Options for venting a bathroom exhaust fan include best to worst.
One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms.
Climb into the attic and clear away any insulation from around the hole.
This involves running ductwork from the fan usually though an attic and out through the roof.
When venting a bathroom exhaust fan make sure to vent the air to the outside rather than into your attic where it can cause mold and mildew to form.
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If you have a bathroom with a separate enclosed toilet you ll also need an additional fan for that space.
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In order to accomplish this the roof has to have a hole cut in it.
There are wall mount exhaust fans as well as ceiling exhaust fans.
Iliving 800 cfm shutter exhaust fan at amazon this fan can easily remove excess heat moisture and odor from any space up to 1 200 square feet.
For quick reference a 50 square foot bathroom needs a 50 cfm fan.
It may also violate a shingle warranty.
Dumping bathroom exhaust into an attic or under roof space invites costly mold contamination frost under the roof in freezing climates moisture damage to roof sheathing possibly even plywood delamination or rot roof failures and shorter roof shingle life.
If you have two bathrooms that are close together and one has an exhaust fan and the other doesn t you might be wondering if you can tie a new exhaust duct into the existing one.
Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.