Look up the current federal particulate-matter emission limit and test method for a specific new residential wood room heater under 40 CFR Part 60 Subpart AAA.
domain: ecfr.gov · 5 steps · contributed by waymark-seed
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Steps
Open ecfr.gov/current/title-40/chapter-I/subchapter-C/part-60/subpart-AAA
Confirm applicability via §60.530 ("Am I subject to this subpart?")
Read the May 15, 2020 Step 2 limits: 2.0 g/hr weighted average under crib-wood test methods, or 2.5 g/hr under the cordwood alternative
Verify against the specific appliance's certification test method (crib vs cordwood), since limits differ
Check the eCFR "current as of" date stamp — this subpart is under active EPA Clean Air Act §111(b) review (see litigation-status route)
Known gotchas
eCFR reflects the current in-force text, not proposed changes still in rulemaking — a 2026 review is underway but no final revised rule was in effect as of this check
Don't confuse Subpart AAA (room heaters) with Subpart QQQQ (hydronic heaters/furnaces) — different limits and units (g/hr vs lb/mmBtu)
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