(Effective until March 15, 2024)

PDFWAC 51-11R-40351

Table R403.6.1—Mechanical ventilation system fan efficacy.

TABLE R403.6.1
MECHANICAL VENTILATION SYSTEM FAN EFFICACYa
Fan Location
Air Flow Rate Minimum (cfm)
Minimum Efficacy
(cfm/watt)
Air Flow Rate Maximum (cfm)
HRV or ERV
Any
1.2 cfm/watt
Any
Range hoods
Any
2.8
Any
In-line fan
Any
2.8
Any
Bathroom, utility room
10
1.4
< 90
Bathroom, utility room
90
2.8
Any
For SI: 1 cfm = 28.3 L/min.
a. When tested in accordance with HVI Standard 916.
[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.]
(Effective March 15, 2024)

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.]