Suburban SF-25FQ 2390A 2555 Furnace 25,000 BTU Ducted RV FurnaceFeatures The SF FQ 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 front of FQ units. Specifications Dimensions: 7. 5" x 17" x 20" Weight: 29 pounds BTU h: Inputs 25,000 Voltage: 12 Amp Draw: 7 Ducts Required: 3 4" Required Return (in): 55" Uses LP (Propane) for fuel. Replaces: SF 25FQ, SF25, SF25Q, SF 25VHQ, SF 25VHFQ, SF