Quiet, vented heater for residential and commercial use easily heats 2- to 3-car garage. Requires only 1in. clearance from ceiling with 2 included angle brackets which means heater is up and out of the way. Power exhaust allows for vertical or horizontal venting. Low-profile cabinet measures 18in.W x 12in.D x 25in.H. Venting kit required (sold separately, Item#s 173642 or 173644).Optional thermostat also available (sold separately, Item# 173641). Operates on natural gas75,000 BTU output heats 2- to 3-car garageRequires only 1in. clearance from ceilingPower exhaust allows horizontal or vertical ventingOnly 18in.W x 17in.D x 25in.HDesigned for right or left side piping, electrical and flue connections by simply rotating 180 Tubular heat exchanger and spark controlledVenting kit required (sold separately, Item#s 173642 or 173644)Optional thermostat also available (sold separately, Item# 173641)10-year limited warranty on heat exchanger; 3-year limited warranty on parts and burner