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Community and Q&A

Is it a good idea to vent a bath fan exhaust out of eyebrow roof?

alumniu | Posted in Energy Efficiency and Durability on

I originally liked the idea of venting the bath fans out a gable end of the house in order to minimize roof penetrations on the steel roof. I did some research into venting through the main roof soffit vents, and obviously that is not a great idea due to the possibility of drawing moist air back into the roof.

However, I will be having a couple eyebrow roofs over the windows on the gable ends that seem like would be excellent spots to exhaust the bath fans. I originally intended to use non-vented soffit on these small roof sections, but perhaps I could use vented soffits here and dump the bath exhaust air into these?

Can you think of any implications or downsides to venting into / out-of an eyebrow roof?

Climate zone 5

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  1. GBA Editor
    Martin Holladay | | #1

    If you are routing the ducts to the gable walls, why not use normal wall terminations?

    Bath exhaust ducts installed in soffits in cold climates can develop icicles. I would use a regular wall termination if I were you.

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