It cannot move air to a crawlspace or attic.
Vent shower into attic.
Can you vent a bathroom exhaust fan into the soffit vents.
It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly.
Draw a mark on the bathroom ceiling where you d like to install the vent fan.
Climb into the attic and clear away any insulation from around the hole.
If you re tempted to vent your exhaust fan through an existing roof vent or even vent it into the attic don t do it.
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.
If you vent the bathroom exhaust fan to close to the soffit vents which are vented plates under your homes outer edge and roof your home the air can be sucked right back into the attic from the soffit.
The lowdown on venting your bath fan into an attic is that it can be done but it should terminate on the outside.
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.
So you do need to get that vented outside whether it s through the siding with one of those trap doors that sort of opens out every time you ve got it on or through the soffit.
This involves running ductwork from the fan usually though an attic and out through the roof.
While this may seem obvious homeowners may out of convenience direct the vent into either of these locations.
First you ll partially block your roof vent with the piping reducing the flow of cooling air through your attic.
This section notes that air exhausted from the bathroom must be sent outdoors not indoors to the same residence or indoors to any other dwelling unit.
Second during cold winters you ll be blowing warm moist air onto a cold surface the roof vent and roof plywood.
Because what happens is when the insulation gets moist from all that moisture that s being dumped into the attic it completely cuts down on the r value of the insulation.
Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.
In fact i have seen numerous houses that haven t yet had signs of mold with the bath fan venting incorrectly.
Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.
The truth about attic bathroom venting.
No you cannot vent the bathroom exhaust fan into the soffit vents.
Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic.
Our article bathroom ventilation codes specs cites the importance of venting bath vent fans to the outdoors not into an attic or crawl space.
Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons.
