Assessments - 4, GPA: 4.5
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8. Apply sealant between vent pipe and opening to provide weather-tight seal F. CPVC/PVC Vertical Venting System Refer to Figures 3, 4, 5, 8, 9 & 10. NOTICE Roof penetrations require the use of roof flashing and storm collar that are not supplied with boiler. Vent Piping - Vertical 1. See Paragraph D for instructions on attaching the vent system connector to the boiler. 2. Do not exceed maximum vent length. Refer to Table 7 for pipe diameters and allowable lengths. 3. Horizontal vent pipe must maintain a minimum . inch per foot slope down towards boiler. 4. Install fire stops where vent passes through floors, ceilings or framed walls. The fire stop must close the opening between the vent pipe and the structure. 5. Whenever possible, install vent straight through the roof. Refer to Figures 9 and 10. Figure 6 : Direct Vent - Side Wall Terminations Figure 7: Location of Vent Terminal Relative to Windows, Doors, Grades, Overhangs, Meters and Forced Air Inlets (Combustion Air Terminal not shown) 17 a. Size roof opening to maintain minimum clearance of 1 inch from combustible materials. b. Extend vent pipe to maintain minimum vertical and horizontal distance of twelve (12) inches from roof surface. Allow additional vertical distance for expected snow accumulation. Provide brace as required. CAUTION Vertical venting requires the use of roof flashing and a storm collar to prevent moisture from entering the structure. c. Install storm collar on vent pipe immediately above flashing. Apply Dow Corning Silastic 732 RTV Sealant between vent pipe and storm collar to provide weather-tight seal. 6. Install Rodent Screen and Vent Terminal (supplied with boiler), see Figure 8 for appropriate configuration. Figure 8: Rodent Screen Installation Figure 9: Direct Vent - Vertical Terminations Figure 10: Direct Vent - Vertical Terminations with Sloped Roof Extend vent/combustion air piping to maintain minimum vertical (‘X’) and minimum horizontal (‘Y’) distance of twelve (12) inches (18 inches Canada) from roof surface. Allow additional vertical (‘X’) distance for expected snow accumulation. 7. Brace exterior piping if required. Combustion Air Piping - Vertical 1. See Paragraph D for instructions on attaching the vent system connector to the boiler. 2. Do not exceed maximum combustion air length. Refer to Table 7 for pipe diameters and allowable lengths. 3. Horizontal combustion air pipe must maintain a minimum . inch per foot slope down towards boiler. 4. Locate combustion air termination on the same roof location as the vent termination to prevent nuisance boiler shutdowns. Combustion air terminal can be installed closer to roof than vent. 5. Start at vent connector on burner enclosure (rear boiler jacket) and work towards the combustion air terminal. 6. Size roof opening to allow easy insertion of combustion air piping and allow proper installation of flashing and storm collar to prevent moisture from entering the structure. a. Use appropriately designed vent flashing when passing through roofs. Follow flashing manufacturers’ instructions for installation procedures. b. Extend combustion air pipe to maintain minimum vertical and horizontal distance of twelve (12) inches from roof surface. Allow additional vertical distance for expected snow accumulation. Provide brace as required. c. Install storm collar on combustion air pipe immediately above flashing. Apply Dow Corning Silastic 732 RTV Sealant between combustion air pipe and storm collar to provide weather-tight seal. 7. Install Rodent Screen and Combustion Air Terminal (supplied with boiler), see Figure 8 for appropriate configuration. 8. Brace exterior piping if required. G. Optional Snorkel CPVC/PVC Horizontal Vent System Refer to Figures 3, 4, 5, 7, 8 and 11. This installation will allow a maximum of seven (7) feet vertical exterior run of the vent/combustion air piping to be installed on the CPVC/PVC horizontal venting application (Section E). nOTiCE Exterior run to be included in equivalent vent/ combustion air lengths. Vent Piping - Snorkel 1. See Paragraph D for instructions on attaching the vent system connector to the boiler. 2. Do not exceed maximum vent length. Refer to Table 7 for pipe diameters and allowable lengths. 3. Horizontal vent pipe must maintain a minimum . inch per foot slope down towards boiler 4. After penetrating wall/thimble, install a Schedule 40 PVC 90° elbow so that the elbow leg is in the up direction. 5. Install maximum vertical run of seven (7) feet of Schedule 40 PVC vent pipe. See Figure 11. Figure 11: Direct Vent - Optional Side Wall Snorkel Terminations 6. At top of vent pipe length install another PVC 90° elbow so that elbow leg is opposite the building’s exterior surface. 7. Install Rodent Screen and Vent Terminal (supplied with boiler), see Figure 8 for appropriate configuration. 8. Brace exterior piping if required. Combustion Air Piping - Snorkel 1. See Paragraph D for instructions on attaching the vent system connector to the boile...
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