"The TPI air curtain works wonders at keeping outside air out and inside air in. Features discharge vanes that extend the entire length of the curtain and adjust to optimize airflow performance. Volts 120, Amps 3.8/4.4 low/high, Finish Type Powder-coat, Watts 199/509 low/high, Air Delivery CFM 764/4,168 low/high, Variable Speed Yes, HP 1/2, Mounting Type Above window, doorway, Speed RPM 562/1,636 low/high, Material Type 20-ga. steel, Thermal Overload Protection Yes, Assembly Required No, Common Usage Maintains environmental separation, Mount Height in. Up to 120. Cabinet constructed of 20 gauge rigid steel with baked-on epoxy powder-coat paint for durability Discharge vanes extends the entire width of the unit and are adjustable for optimum performance of air flow Blowers are forward curved centrifugal type, DWDI with corrosion-resistant scroll and wheel Motor is heavy duty, PSC, direct drive high efficiency and designed for use with SCR controller Permanently lubricated for long life and has thermal overload protection Has double insulation protection for quieter operation Quick disconnects supplied to accommodate easy installation and service of motor SCR Speed Controller supplied on all units compatible with the motor with low end adjustment for air volume control and savings in power consumption Electric heat option available"