Upflow or horizontal - Supply air 16 inches front to back and 18 inches wide - Return air 18-1/2 inches front to back and 16 inches wide - Factory installed coil - Convertible horizontal drain pan - 18 inch x 20 inch x 1 inch filter - 38,700 heating BTU - 7/8 OD hot water coil connection - Multi- function microprocessor circuit board - Blower Start Relay allows direct wiring from the boiler to the air handler - Blower on fan delay preheats the hot water coil for 45 seconds - Blower off fan delay allows the blower to operate for 45 seconds after the thermostat is satisfied - The microprocessor powers either 120 volt or 24 volt motorized zone valves (not included) - Factory installed R410A TXV valve - Manual air vent on hot water coil - Blower door shut off switch - Slide out hot water coil for easier service - Copper tube heating and cooling coils - Compatible with all major brands of split condensing units and heat pumps - Attractive baked on powder coated cabinet - Primary and secondary condensate drain connections - Easily accessible air filter