{"data":{"id":"us/10-cfr-460.204","jurisdiction":"us","citation":"10 CFR 460.204","heading":"Mechanical ventilation fan efficacy.","body":"(a) Whole-house mechanical ventilation system fans must meet the minimum efficacy requirements set forth in table 1 to 460.204(a), except as provided in paragraph (b) of this section. The mechanical ventilation fan efficacy requirements are adapted from section R403 of the 2021 IECC.\nTable 1 to § 460.204(a)—Mechanical Ventilation System Fan Efficacy\nFan type description Airflow rate minimum (cfm) Minimum efficacy (cfm/watt)\nHeat recovery ventilator or energy recovery ventilator Any 1.2\nIn-line supply or exhaust fans Any 3.8\nOther exhaust fan \u003c90 2.8\nOther exhaust fan ≥90 3.5\n(b) Mechanical ventilation fans that are integral to heating, ventilating, and air conditioning equipment, including furnace fans as defined in § 430.2 of this subchapter, are not subject to the efficiency requirements in paragraph (a) of this section.","path":["Title 10—Energy","CHAPTER II—DEPARTMENT OF ENERGY","SUBCHAPTER D—ENERGY CONSERVATION","PART 460—ENERGY CONSERVATION STANDARDS FOR MANUFACTURED HOMES","Subpart C—HVAC, Service Hot Water, and Equipment Sizing"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-10.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:24:09Z","sha256":"eb329cd57d0ed7c636fda9bb344e77566a2e0c863783bb8e2289c20af29be889","source_id":"us-cfr","stale":true,"prev":"us/10-cfr-460.203","next":"us/10-cfr-460.205"},"notice":"GroundRules: Original legal text. Not legal advice."}