488. Slide the adapter over the vent pipe and align the screwholes in the adapter with the dimples in the furnace casing.9. Pilot drill 1/8--in. screw holes for the adapter in the casingand secure the adapter to the furnace with sheet metalscrews.10. Loosen the clamps on the rubber vent coupling.11. Slide the end of the coupling with notches in it over thestandoffs in the vent pipe adapter.12. Tighten the clamp of the coupling over the vent pipeadapter. Torque the lower clamp around the vent pipeadapter to 15 lb--in.13. Pilot drill a 1/8--in. hole in the combustion air pipe adapter.14. Complete the vent and combustion air pipe as shown in“Install the Vent and Combustion Air Pipe.”FOR POLYPROPYLENE VENTING SYSTEMSWhen using polypropylene venting systems, all ventingmaterials used, including the vent terminations, must be fromthe same manufacturer.NOTICEInstalling the Vent TerminationRoof TerminationsA roof termination of any type will require a 4-in. (102 mm)flashing for a 2 in. (50 mm ND) concentric vent or a 5--in. diameter(127 mm) flashing for a 3-in. (80 mm ND) concentric vent kit. Fortwo-pipe or single pipe vent systems, a flashing for each pipe of therequired diameter will be necessary.It is recommended that the flashing be installed by a roofer orcompetent professional prior to installing the concentric vent. Theterminations can be installed on a flat or pitched roof.Concentric VentSingle or multiple concentric vent must be installed as shown inFig. 52. Maintain the required separation distance between ventsor pairs of vents as shown in Fig. 52 and all clearance shown inFig. 50.NOTE: Follow the instructions of the vent terminal manufacturer.These instructions are provided as a reference, only.Cut one 4--in. (102 mm) diameter hole for 2--in. (50 mm ND) kit,or one 5--in. (127 mm) diameter hole for 3--in. (80 mm ND) kit inthe desired location.Loosely assemble concentric vent/combustion air terminationcomponents together using instructions in kit.Slide assembled kit with rain shield REMOVED through hole inwall or roof flashing.NOTE: Do not allow insulation or other materials to accumulateinside of pipe assembly when installing it through hole.Disassemble loose pipe fittings. Clean and cement using sameprocedures as used for system piping. DO NOT CEMENTPOLYPROPYLENE FITTINGS.Two--Pipe and Single--Pipe TerminationsSingle and two pipe vent must be installed as shown in Fig. 52 and53. Maintain the required separation distance between vents orpairs of vents as shown in Fig. 52 and 53 and all clearance shownin Fig. 50 and 51 .RECOMMENDED SUPPORT FOR VENTTERMINATIONSIt is recommended that rooftop vent terminations in excess of36 inches (1 M) in vertical length be supported by EITHERthe Direct Vent Termination Kit shown in Table 13 or byfield--supplied brackets or supports fastened to the structure.NOTICECut the required number of holes in the roof or sidewall for ventand (when used) combustion air pipes. Sidewall holes for two-pipevent terminations should be side-by-side, allowing space betweenthe pipes for the elbows to fit on the pipes.Holes in the roof for direct--vent two--pipe terminations should bespaced no more than 18 in. (457 mm) apart to help avoid vent gasrecirculation into combustion air intake.Termination elbows will be installed after the vent and (if used)combustion air pipe is installed.Sidewall TerminationsConcentric VentNOTE: Follow the instructions of the vent terminal manufacturer.These instructions are provided as a reference only.Determine an appropriate location for termination kit using theguidelines provided in section “Locating The Vent Termination” inthis instruction.1. Cut one 4--in. diameter hole for 2--in. kit, or one 5--in. dia-meter hole for 3--in. kit.2. Loosely assemble concentric vent/combustion air termina-tion components together using instructions in kit.3. Slide assembled kit with rain shield REMOVED throughhole.NOTE: Do not allow insulation or other materials to accumulateinside of pipe assembly when installing it through hole.4. Locate assembly through sidewall with rain shield posi-tioned no more than 1--in. (25 mm) from wall as shown inFig. 52.5. Disassemble loose pipe fittings. Clean and cement usingsame procedures as used for system piping. DO NOT CE-MENT POLYPROPYLENE FITTINGS.2-Pipe and 1-Pipe Vent TerminationNOTE: Follow the instructions of the vent terminal manufacturer.These instructions are provided as a reference, only.RECOMMENDED SUPPORT FOR VENTTERMINATIONSIt is recommended that sidewall vent terminations in excess of24 inches (0.6 M) in vertical length be supported by EITHERthe Direct Vent Termination Kit shown in Table 13 or byfield--supplied brackets or supports fastened to the structure.NOTICEDetermine an appropriate location for termination kit using theguidelines provided in section “Locating The Vent Termination” inthis instruction.1. Cut two holes, one for each pipe, of appropriate size forpipe size being used.2. Loosely install elbow in bracket (if used) and place as-sembly on combustion--air pipe.3. Install bracket as shown in Fig. 52 and 54.NOTE: For applications using vent pipe option indicated bydashed lines in Fig. 52 and 53, rotate vent elbow 90_ fromposition.59SC2C