The Horizontal Basic Belt-Driven Air Handler (A1-B) draw-through designs are available for either indoor or outdoor applications and are equipped with blowers that can handle up to 3.75 ESP. The A1-B is housed in heavy-gauge galvanized cabinet and insulated with ½-inch thick, over three pound, neoprene-coated fiberglass. The A1-B comes with a ½-inch OD copper tube coil, forward-curved, dynamically balanced belt-driven blowers, motor, and a galvanized steel, powder-coated epoxy drain pan insulated with ⅛-inch thick insulation. A flat filter section, with a two-inch, 30% pleated efficiency filter is included. Access doors are located on both sides of the unit for easy maintenance. Supply and return-air openings have a one-inch duct collar.