Good points thanks. How much do flaps impede the flow?
Insect screen mesh for vent fan outlet
May 30, 2016
23 Replies
I was referring to mine :)
As it's a downwards facing soffit vent, it's open all the time - and the fan's an axial in line, so that doesn't have one either (never had a problem with wind blowing in with that arrangement).
But point taken WRT to the OP...
Flying? Doubt it.
Crawling? Pretty conceivable see my PP (But NOBODY lives in a completely sealed house).
Depends.
When two successive house painters have covered the light plastic flaps with masonry paint - quite a lot.
(I gave up. There's a flap on the fan too, so I fixed the outside ones open at 45 degrees, enough to let air through but keep rain mostly out)
Andy
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