Whatever area you block with the exhaust duct is a reduction in the area of the gable vent.
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However your roofer is correct that bathroom exhaust venting is desirable to avoid indoor moisture problems that can extend to the attic roof sheathing and can affect roof life.
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And of course a bathroom with a window doesn t require an exhaust vent.
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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These pipes come in 10 foot length and the bell end must face the fan.
The cooler outside will be allowed to be sucked through your soffit vents and expel the hotter humid air through your gable vents.
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If you vent through the roof condensation will drip back into the interior.
Depending on how the attic ventilation is designed the hot moist air exhausted from the duct could be drawn back into the attic through the gable vent.
The best way to vent bathroom fans is with schedule 20 bell end drain pipe.
Options for venting a bathroom exhaust fan include best to worst.
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.
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First off you ll be reducing the size of the gable vent.
When gable end vents are combined with soffit vents this can keep a continuous air flow through your roof or attic.
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Through the roof or an exterior gable wall.
The resistance to the airflow in the long duct caused the air to back up in the nearest bathroom especially when more than one fan was on at the same time.
Crawling in the attic revealed the connection of four bath fans into one long duct going to a gable vent.
This will help reduce the humidity in your roof reducing the risk of damaging your roof.