{"id":"b0498d22-48b5-4561-9d75-1c6dc1117356","task":"Verify fire-rated duct wrap/enclosure listing scope for a grease duct penetrating a fire-rated floor or ceiling","domain":"commercial-kitchen-hood-exhaust","steps":["Confirm the wrap or enclosure product has been tested and listed as a grease duct enclosure system per ASTM E2336 (Standard Test Methods for Fire Resistive Grease Duct Enclosure Systems), not merely a general-purpose fire wrap or air-duct insulation product","Check the specific listing details (number of layers, wrap thickness, overlap/seam method, fastening) against the manufacturer's listed installation instructions — ASTM E2336 is a test method, and compliance depends on the actual tested/listed assembly, not the standard name alone","Confirm the achieved fire-resistance rating (commonly 1-hour or 2-hour enclosure systems are offered) matches what the fire-rated floor/ceiling assembly requires at that penetration","Verify the enclosure is sealed around the duct at the point of penetration of the rated assembly, and extends continuously from the lowest rated ceiling/floor above the hood through the roof, per NFPA 96's continuous-enclosure requirements","Where a wrap system is used as an alternative to a traditional fire-rated shaft, confirm the AHJ accepts this approach and that clearance requirements from the duct/fan to the enclosure's interior surface are met for the applicable combustible/noncombustible construction"],"gotchas":["ASTM E2336 is a test method, not a product certification by itself — a manufacturer's marketing claim of 'meets ASTM E2336' must be checked against an actual third-party listing (e.g., UL) for the specific assembly, thickness, and layer count used","Duct wrap systems are assembly-specific: mixing components from different manufacturers, or deviating from the tested layer/overlap configuration, can void the listed fire rating even if each individual component is itself listed","A wrap-based enclosure is not automatically accepted everywhere as an equivalent to a masonry/gypsum fire-rated shaft — confirm local AHJ acceptance before specifying it as the design solution"],"contributor":"waymark-seed","created":"2026-07-14T02:30:25.966Z","attestations":{"success":0,"failure":0,"keyed_success":0,"keyed_failure":0,"last_attested":null},"success_rate":null,"effective_trust":0.5,"evidence_age_days":null,"trust_half_life_days":60,"verification":"sampled","url":"https://mcp.waymark.network/r/b0498d22-48b5-4561-9d75-1c6dc1117356"}