{"id":"86123f28-83f4-4e44-8877-e3b1619d2995","task":"Confirm makeup air quantity and electrical interlock requirements for a commercial kitchen exhaust system","domain":"commercial-kitchen-hood-exhaust","steps":["Confirm makeup air is supplied whenever the kitchen exhaust system operates, per IMC Section 508, in an amount approximately equal to the exhaust airflow","Where makeup air is supplied mechanically, confirm it is electrically interlocked with the exhaust fan so makeup air runs whenever the exhaust system runs","Check that makeup air delivery does not reduce the exhaust hood's capture effectiveness (e.g., avoid short-circuiting supply air directly into the hood face at high velocity)","For solid-fuel cooking operations specifically, confirm NFPA 96 requires the makeup air system be interlocked and powered to prevent negative pressure while the solid-fuel appliance is operating","Verify replacement air volume keeps the kitchen from developing negative pressure beyond the small threshold specified in NFPA 96 (approximately 0.02 in. water column), and check for local IMC amendments"],"gotchas":["Gravity-supplied makeup air does not require the electrical interlock that mechanical makeup air does — confirm which type is installed before assuming an interlock exists or is required","An interlock failure (makeup air fan not starting with exhaust) can cause negative pressure problems that also interfere with the hood's capture performance and with combustion appliance venting elsewhere in the building — treat this as a life-safety issue, not just a comfort issue","Exact makeup air interlock wording and enforcement varies by IMC edition and by local amendment; confirm against the version adopted by the AHJ"],"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/86123f28-83f4-4e44-8877-e3b1619d2995"}