Air volume: 2 - 2400 cfm Maximum SP: 1.5" wg. @ standard air densityAxial Direct Drive Fans are the perfect low cost exhaust choice in the areas that have little or no ductwork, and thus, relatively low to moderate resistance.FEATURES & BENEFITSSpun aluminum housing for rust-free weather resistant durabilityPropellers constructed with die formed blades riveted to a steel hubCan be roof or wall mountedStandard bird screenWire conduit to provide a clear channel for electrical connectionsEmergency Disconnect SwitchOPTIONSGravity Damper.Motorized Damper.Wall Mount Sleave.Roof Curb.