[molson209]

Put a cap on Bathroom Exhaust Vent in the Roof

[Calvin Locke]

I had a house that had a secondary stack vent under the back porch. That is, a couple of feet off the ground, iirc.

Can't remember if it was screened. You'd think I'd remember, since I had to remove a bird's nest from the bathroom exhaust vent. A neighbor had had the same problem, and gave me enough screen mesh to enclose the exhaust vent cover.

Then again, I discovered stack vent while doing electrical work, and it wasn't a pleasant place to be...

FWIW, the house was built ~1906.