Suburban SF-25Q Furnace 25,000 BTU 2556A Ducted RV FurnaceFeatures The SF Q series furnaces from Suburban provide maximum heating performance in a ducted unit for increased design flexibility in mid size and large RVs. Please note the gas connects in the back of the Q units. Specifications Dimensions: 7. 5" x 17" x 20"Weight: 29 poundsBTU h: Inputs 25,000Voltage: 12Amp Draw: 7Ducts Required: 3 4"Required Return (in): 55" Uses LP (Propane) for fuel. Replaces: SF25, SF25Q, SF20, and SF 20QDometic DFMD Furnaces