75,000 BTU/hr, NG, Duct Furnace. 82% efficient. Aluminized steel tubular heat exchanger. Separated combustion (combustion air ducted to burner from outdoors) model. Reduce dirt build-up on burners, avoid ingestion of contaminants into burner and extend life of heat exchanger with separated combustion. 4" OD combustion air duct connection Direct spark ignition. Inshot burner design. Power vented exhaust (4" OD) capable rear or top flue discharge. Low voltage thermostat connection incorporated on rear of unit. Low clearances to combustibles dimensions. Approved for upstream of a refrigeration system. 120V 60Hz 1ph power supply required. 1/2" gas connection. CSA approved to ANSI Z83.8/CSA 2.6.