Rheem RH1V4821STANJA - RH1V - Series, 4 Ton, R-410A, Single Stage, Aluminum Air Handler, ECM Motor, 208/240V, 1 Ph, 60 HzPlease Note! This model is now AHRI rated with the 13PJL Series heat pump. No other pre 2015 platform heat pumps will be listed with aluminum indoor products!RH1V/RH2V- Series, ECM Motor, Efficiencies up to 16 SEER:Includes an energy efficient ECM® Motor, which in most applications, enhances the SEER rating of the outdoor unit. It also slowly ramps its speed up for quiet operation and enhanced customer satisfaction.Versatile 4-way convertible design for upflow, downflow, horizontal left and horizontal right applications.Nominal airflow up to 1.0" external static pressure.Factory-installed indoor coil.Sturdy cabinet construction with 1.0 inch [25.4 mm] of foil faced insulation for excellent sound and insulating characteristics.Field-installed auxiliary electric heater kits (not included) provide exact heat for indoor comfort. Kits include circuit breakers which meet U.L. and cUL requirements for service disconnect.Dip switch settings for selectable, customized cooling airflow over a wide variety of applications.On-demand dehumidification terminal that adjusts airflow to help control humidity for unsurpassed comfort in cooling mode.External filter required.Evaporator coil is constructed of aluminum fins bonded to internally grooved aluminum tubing.