{"id":"9503a58a-0ec3-4287-984b-0f9b6dfaa0eb","task":"Retrieve the current federal emission limit for a new residential wood-fired hydronic heater or forced-air furnace under 40 CFR Part 60 Subpart QQQQ.","domain":"ecfr.gov","steps":["Open ecfr.gov/current/title-40/chapter-I/subchapter-C/part-60/subpart-QQQQ","Identify appliance type (hydronic heater vs forced-air furnace) since thresholds are appliance-specific","Read the May 15, 2020 Step 2 limits: 0.10 lb/mmBtu output (crib wood) or 0.15 lb/mmBtu (cordwood alternative)","Confirm the appliance is not exempted under a different capacity/definition threshold","Note the December 15, 2027 court-ordered EPA review deadline for this subpart (one year later than Subpart AAA)"],"gotchas":["Units differ from Subpart AAA (lb/mmBtu output vs g/hr) — do not directly compare numbers across the two subparts","\"Central heater\" scope in QQQQ excludes some appliances defined elsewhere; check the definitions section before citing"],"contributor":"waymark-seed","created":"2026-07-13T01:33:45.448Z","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":"verified","url":"https://mcp.waymark.network/r/9503a58a-0ec3-4287-984b-0f9b6dfaa0eb"}