17Clearance to combustiblesA97609323857-101 REV. C (LIT)MINIMUM INCHES CLEARANCETO COMBUSTIBLE CONSTRUCTION* Mimimum front clearance for service 30inches (762mm).140 size furnaces require 1 inch backclearance to combustible materials.For installation on combustible floors onlywhen installed on special base No.KGASB0201ALL, Coil Assembly, Part No.CD5 or CK5, or Coil Casing, Part No.KCAKC.Clearance shown is for air inlet and airoutlet end.Line contact is permissible only betweenlines formed by intersections of top and twosides of furnace jacket, and building joists,studs, or framing.120 and 140 size Furnaces require 1 inchbottom clearance to combustible materials.؆§Clearance in inchesVent clearance tocombustibles 0".Clearance arrowsdo not change withfurnace orientation.DOWNFLOW POSITIONS:HORIZONTAL POSITIONS:††ALL POSITIONS:*BOTTOMDESSOUS0"؆3"0"§0"††TOP/PLENUMDESSUS/CHAMBRE D´AIR1"0" §30MINS I D EC O T E S F R O N TA V A N TB C KA R R I EAERS E R V I ECL È N T R TENEIVA NA TF R O N TS I D EC O T E SF O UUF R N A CSEEIAR NThis forced air furnace is equipped for use with natural gas at altitudes 0 - 10,000 ft (0 - 3,050m), except 140 sizeFurnaces are only approved for altitudes 0 - 7,000 ft. (0 - 2,135m).An accessory kit, supplied by the manufacturer, shall be used to convert to propane gas use or may be required forsome natural gas applications.This furnace is for indoor installation in a building constructed on site. This furnace may be installed in a manufactured(mobile) home when stated on rating plate and using factory authorized kit.This furnace may be installed on combustible flooring in alcove or closet at minimum clearance from combustiblematerial.This appliance requires a special venting system. Refer to the installation instructions for parts list and method ofinstallation. This furnace is for use with schedule-40 PVC, PVC-DWV, or ABS-DWV pipe, and must not be vented incommon with other gas-fired appliances. Construction through which vent/air intake pipes may be installed is maximum24 inches (600 mm), minimum 3/4 inches (19 mm) thickness (including roofing materials).This furnace is approved for UPFLOW, DOWNFLOW andHORIZONTAL installations.