Vent Screens: A Weak Point in Older Houses
Attic and crawlspace vent screens are a frequently overlooked opening in the building envelope, and older houses commonly have screens that are damaged, coarse enough to admit embers, or missing entirely. The article examines how embers enter through these openings, what current ASTM E2886 and State Fire Marshal listing requirements involve for houses in Wildland-Urban Interface areas, and how tighter mesh affects ventilation air flow. Includes a glossary of key terms.
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