{"id":"mech-009","license":"CC-BY-4.0","data":{"title":"Char front on 2x vs 6x at 1.5 in/hr nominal (E119 clock, NTS)","file":"/diagrams/mech-009-char-front-2x-vs-6x.svg","caption":"FA Exhibit MECH-009. Char front on 2x versus 6x.","alt":"At the one-hour AWC FDS reference point, four-side cross-sections show a nominal 1.5-inch char depth consuming the narrow dimension of a 2x4 while leaving a core in a 6x6. A separate dashed line marks the 1.8-inch effective char depth used for structural section properties. This is an NTS furnace-clock comparison, not a wildfire claim or rating.","kind":"diagram","rights":"cc-by-4.0","depicts":"At the AWC FDS one-hour reference point, the nominal 1.5 in./hr rate gives a 1.5-in","identifiableAddress":false,"exifGpsStripped":true,"derivation":"AFTER AWC FDS 2024 §§3.1–3.3 + TABLES 1.5.4 / 3.3.1.2 · ORIGINAL LINE ART.","technicalReviewer":"Grayson Graham","lastVerified":"2026-08-25T00:00:00.000Z"}}