10 CFR § 460.204 - Mechanical ventilation fan efficacy.

---
identifier: "/us/cfr/t10/s460.204"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "10 CFR § 460.204 - Mechanical ventilation fan efficacy."
title_number: 10
title_name: "Energy"
section_number: "460.204"
section_name: "Mechanical ventilation fan efficacy."
chapter_name: "DEPARTMENT OF ENERGY"
subchapter_number: "D"
subchapter_name: "ENERGY CONSERVATION"
part_number: "460"
part_name: "ENERGY CONSERVATION STANDARDS FOR MANUFACTURED HOMES"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "42 U.S.C. 17071; 42 U.S.C. 7101"
regulatory_source: "87 FR 32818, May 31, 2022, unless otherwise noted."
cfr_part: "460"
---


# 460.204 Mechanical ventilation fan efficacy.

(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.

Table 1 to § 460.204**(a)**—Mechanical Ventilation System Fan Efficacy

| Fan type description | Airflow rateminimum(cfm) | Minimumefficacy(cfm/watt) |
| --- | --- | --- |
| Heat recovery ventilator or energy recovery ventilator | Any | 1.2 |
| In-line supply or exhaust fans | Any | 3.8 |
| Other exhaust fan | <90 | 2.8 |
| Other exhaust fan | ≥90 | 3.5 |

(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.