Bathroom Vent Into Attic
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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.
Bathroom vent into attic. There is a possibility that some of that bathroom moisture will get sucked into the attic due to negative attic pressure and air moving into the soffit vent. Bathroom vent fans must be vented to the out of doors. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems. It is never ok to vent directly into an attic even if the attic itself is vented.
The excessive moisture will cause condensation on the roof members insulation and eventually cause mold. Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons. There are actually special bathroom fan vent covers designed to be installed on the soffit vent. Bathroom exhaust fans perform an important function by removing excess moisture from your home.
No you cannot vent your bathroom exhaust fan into the attic. The question about moist air reentering an attic through soffit vents after it has been blown out of an exhaust vent opening is a fair one but i don t think that s likely to be a significant building moisture source. So the simple correct answer is no. Our article bathroom ventilation codes specs cites the importance of venting bath vent fans to the outdoors not into an attic or crawl space.
You should never exhaust the bathroom fan directly into the attic.
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