PDFWAC 51-11R-40351
Table R403.6.1—Mechanical ventilation system fan efficacy.
TABLE R403.6.1
WHOLE HOUSE MECHANICAL VENTILATION SYSTEM FAN EFFICACYa
System Type | Air Flow Rate (cfm) | Minimum Efficacy (cfm/watt) |
HRV, ERV or balanced | Any | 1.2 |
Range hoods | Any | 2.8 |
In-line supply or exhaust fan | Any | 3.8 |
Other exhaust fan | <90 | 2.8 |
Other exhaust fan | ≥90 | 3.5 |
For SI: 1 cfm = 28.3 L/min. | |
a. Design outdoor or exhausted airflow rates/watt of fan used. |
[Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and chapter 19.27A RCW. WSR 23-02-060, 23-12-102, and 23-20-022, § 51-11R-40351, filed 1/3/23, 6/7/23, and 9/25/23, effective 3/15/24. Statutory Authority: RCW 19.27A.045 and chapter 19.27A RCW. WSR 20-21-081, § 51-11R-40351, filed 10/19/20, effective 2/1/21. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160 and chapter 19.27 RCW. WSR 20-01-047, § 51-11R-40351, filed 12/9/19, effective 7/1/20. Statutory Authority: RCW 19.27A.020, 19.27A.045, 19.27A.160, and 19.27.074. WSR 16-02-127, § 51-11R-40351, filed 1/6/16, effective 7/1/16. Statutory Authority: RCW 19.27A.020, 19.27A.045 and chapters 19.27 and 34.05 RCW. WSR 13-04-055, § 51-11R-40351, filed 2/1/13, effective 7/1/13.]