Suburban Mfg 2551A Furnace; SF-FQ Series; LP Gas; Model Number SF-20FQ; 20000 BTU; Maximum Ducted; 7-1/2 Inch Height x 17 Inch Width x 20 Inch Depth; Automatic Direct Spark Ignition; Do Not Require Exterior Access Doors. Attributes BTU Level: 20000 BTU Discharge Type: Side Type: LP Gas Stage: Dual Ignition Type: Direct Spark Ignition Width: 17 Inch Height: 7-1/2 Inch Depth: 20 Inch With Access Door: No   Features & Benefits Direct Discharge Furnaces With Attractive Grilles For Zone Heating Of Smaller RVs, Trailers, Truck Campers And Even Pop-Ups Limited 2 Year Warranty