FA Exhibit DET-012

Bird-block retrofit: mesh vs listed vent swap (compliance pair)

Two schematic eave sections for an underside opening below twelve feet. At left, insect or bird screen is fastened over a straight-through bird-block opening; embers can follow the straight opening and the patch does not meet Oregon R327's special below-twelve-foot underside exception. At right, the opening is replaced by a noncombustible manufactured flame- and ember-resistant vent with an indirect schematic path, presented as a route for building-official review rather than automatic approval. — FA Exhibit DET-012. Bird-block retrofit: screen patch versus manufactured vent swap. AFTER FEMA P-737 FIG. 11, §4.2.1 & TABLE 6 · 2023 ORSC R327.3.2 & R327.3.2.1. Illustrative — not a construction document. Verify with your building official. CC BY 4.0.

Technical review: Grayson Graham. Last verified 2026-08-25. JSON

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<img src="https://fireapproved.com/diagrams/det-012-bird-block-vent-retrofit-pair.svg" alt="Two schematic eave sections for an underside opening below twelve feet. At left, insect or bird screen is fastened over a straight-through bird-block opening; embers can follow the straight opening and the patch does not meet Oregon R327's special below-twelve-foot underside exception. At right, the opening is replaced by a noncombustible manufactured flame- and ember-resistant vent with an indirect schematic path, presented as a route for building-official review rather than automatic approval." />

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