Suburban SF-35VHQ 35,000 BTU Ducted Horizontal Vertical 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. Can be easily installed in areas that might otherwise be left unused with their horizontal OR vertical installation. Specifications Dimensions: 7. 5" x 17" x 20" Weight: 29 pounds BTU h: Inputs 35,000 Voltage: 12 Amp Draw: 8 Ducts Required: 4 4" Required Return (in): 55" Uses LP (propane) for