Air Flow (CFM) HVI-916 Standard:
723 (Low Speed) | 3,440 (High Speed)
Wattage (High): 298
Efficiency @ High (CFM/Watts): 11.5
Sound Level (dba): 52
Speed Settings: 10
Silencer Duct: 20" x 7'
Rough Opening (inches): 22.5 x 26.5
Grille Dimensions (inches): 24.5 x 28.5
Attic Venting* (sq. ft.): 6.9
Open Window** (sq. ft.): 13.8
*Adequate attic ventilation must be available for the fan to operate efficiently. Recommended 1 sq. ft. of net free ventilation per 500 CFM of fan airflow.
** Windows must be opened to safely and effectively operate the fan. Recommended 1 sq. ft. of open windows per 250 CFM of fan airflow.