Venting this fan into the attic is simply asking for problems. Bathroom vent fans must be vented to the out of doors. The excessive moisture will cause condensation on the roof members, insulation and eventually cause mold.
It is never OK to vent directly into an attic even if the attic itself is vented. Jeff Howell your property problems.
I have just replaced the bathroom extractor fan and found that the exhaust is vented into the roof space and not the outside environment.
Due to the shape of the roof there are no soffits to vent through, so it has to go through the roof.
No matter the location of the bathroom , you can vent the exhaust fan through the wall. Ductwork is what will connect the fan to the outside. The location of the bathroom will determine how extensive the ductwork will be.
However, bathrooms that are further from an exterior wall will . First off, I have two bathrooms with bathroom fans.
Each fan vents into its own white plastic tube which runs the length of the attic and ends up near the open louvers. However, the end is just hanging there, inside the attic , but next to the louvers. Special bathroom fan roof vents with an internal damper that opens only when the fan is blowing will send moist air outdoors and keep cold air out of the house.
Most municipalities require extractor and exhaust fans to be vented to the outside of the building with an vent cap. Excessive moisture will cause condensation on roof members and insulation. Therefore, if you vent warm moist air from your bath fan thru your soffit, the soffit will just draw that same warm moist air back into your attic.
This will cause mold and could leave . The damper protects clod air flow back in the bathroom , so it needs to be as close to the insulated portion of the exhaust (near the fan ) as possible. Exception: Whole house ventilation-type attic fans that discharge into the attic space of dwelling units having private attics shall be permitted.
As was said in the comments on your question, you get additional efficiency by clearing hot air in the attic in the process. Ventilating the home and the attic in greater overall cooling by reducing heat that would conduct back through any attic . Warm, moist air should be vented the the exterior and in cold climates can create considerable condensation in the attic when vented inside there. Insulated vent pipe from the fan to the exterior is best.
Where in the world are you reading that bathrooms can be vented directly into attic space?
Other venting options includes running the duct up through the roof or down through the soffit. I am in the process of having my bathroom remodeled.
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