{"id":"mech-006","license":"CC-BY-4.0","data":{"title":"The three exposures: ember vs radiant vs direct flame on one wall","file":"/diagrams/mech-006-three-exposures-one-wall.svg","caption":"FA Exhibit MECH-006. Three wildfire exposures on one wall.","alt":"One teaching wall section receives three separate FEMA-defined pathways: wind-carried embers at joints and openings, radiant heat across an air gap, and direct flame contact. The paths are not ranked.","kind":"diagram","rights":"cc-by-4.0","depicts":"FEMA P-737 separates building ignition into radiant heat transfer, direct flame impingement, and direct ember exposure","identifiableAddress":false,"exifGpsStripped":true,"derivation":"AFTER FEMA P-737 FIGURE 2 + §4.3 EXTERIOR WALLS · PUBLIC-DOMAIN SOURCE.","technicalReviewer":"Grayson Graham","lastVerified":"2026-08-25T00:00:00.000Z"}}