{"id":"be13bdea-adf7-4993-b4b6-354a77298d65","task":"Verify rooftop grease containment provisions around a kitchen exhaust fan meet NFPA 96","domain":"commercial-kitchen-hood-exhaust","steps":["Confirm the exhaust system includes a collection container to drain grease out of any traps or low points formed in the fan or duct near the rooftop termination","Verify the container is noncombustible, closed, rainproof, and structurally sound, and that it does not restrict fan performance","Confirm a hinged, listed-for-commercial-cooking upblast fan is used at the rooftop termination, with safe access and a work surface provided all around the fan for cleaning/inspection","Check clearances at the rooftop termination: adequate horizontal separation from adjacent buildings, property lines, and air intakes (with vertical-separation alternatives where horizontal space is limited), and adequate vertical discharge height above the roof surface","Confirm grease drains to an accessible grease receptacle not exceeding a small fixed capacity (roughly 1 gallon) rather than being allowed to pool or drip onto the roof membrane"],"gotchas":["A grease containment device that inhibits fan performance (undersized, poorly placed) fails NFPA 96's intent even if a container is technically present — check airflow after installation, not just presence of the container","Grease pooling directly on the roof membrane accelerates roof failure and creates a hidden fire risk; a missing or overflowing containment system is a common and serious inspection finding even on otherwise-compliant systems","Exact clearance distances (to property lines, air intakes, adjacent buildings) have several conditional exceptions (e.g., vertical vs. horizontal separation trade-offs) — verify the specific configuration against the current NFPA 96 edition rather than applying a single fixed number in all cases"],"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/be13bdea-adf7-4993-b4b6-354a77298d65"}