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Posted By: JulianI hold an off-cut over my mouth and try to breathe through it (I did warn you it was unscientific!) The cheapest membrane (Protec 400) was much harder to breathe through than some of the others like Corovin. I don't have any more results 'cause I passed out shortly after...
Posted By: fostertomYou can roughly assess air tightness by blowing through a membrane (I prefer to suck!) but that tells you nothing at all about its vapour resistance/breathabilty.
Posted By: fostertomTrue - the steady-state myth, for a start.
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