OAB400 Series provides a high airflow rating of 1900 cfm and maximum static pressure value of 5.4 in-w.c. Meeting UL Class B insulation requirements, the 15.9 x 6.4” (404 x 162 mm) motorized impeller has an all-metal impeller, sealed dual-ball-bearing design, and die cast aluminum frame. The blower also includes the required capacitor.