Instructions / Assembly

MasterFlow®TechnicalServices
1‐800‐211‐9612

MasterFlow®TechnicalServices
1‐800‐211‐9612

gaf.com
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Master Flow® Automatic Foundation Vent
FVRABL
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APPLICATION INSTRUCTIONS
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1.Knockouttheoldventwithahammerand
removeallmortarifnecessarytocreatean8”x
16”opening.
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2.Placesideofventintoopeningfirst.Pushthe
othersideintoplace,makingsurethevent
flangesarefirmlyagainstwall.
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3.Threadscrews
throug
huntiltheytouchside
walls,thentightenasnecessarytocre ateasnug
fit.
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4.Fitsstandard8”x16”opening.No special
toolsrequired.F.H.A.(FederalHousing
Authority)requires1sq.ft.ofnetfree
ventilationareaforeach150sq.ft.ofcrawl
spacewithoutvaporretar
der.
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