valutazioni - 4, GPA: 4.3
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Do not pack air spaces with insulation. 2. Set the gas appliance in the desired location. Drop a plumb bob down from the ceiling to the position of the appliance flue exit, and mark the location where the vent will penetrate the ceiling. Drill a small hole at this point. Next, drop a plumb bob from the roof to the hole previously drilled in the ceiling, mark the spot where the vent will penetrate the roof. Determine if ceiling joists, roof rafters, or other framing will obstruct the venting system. You may wish to relocate the appliance, or to offset, to avoid cutting load bearing members. 3. To install the Round Support Box/Wall Thimble in a flat ceiling, cut a 10 inch (25.4 cm) square hole in the ceiling, centered in the hole drilled in Step 2. Frame the hole as shown in Figure 29. 4. Assemble the desired lengths of black pipe and elbows necessary to reach from the appliance adapter up through the Round Support Box. Insure that all pipe and elbow connections are in their fully twist-locked position. 5. Cut hole in the roof centered on the small hole placed in the roof from Step 2. The hole should be of sufficient size to meet minimum requirements for Clearance to Combustibles, as specified. Continue to assemble lengths of pipe and elbows necessary to reach from the ceiling support box up through the roof line. Galvanized pipe and elbows may be utilized in the attic, as well as above the roof line. The galvanized finish is desirable above the roof line, due to the higher corrosion resistance. 6. Once the pipe sections have been joined, and run up through the hole in the roof, slip an elbow strap over the exposed sections, bend the support straps outwards, and push the VerticalVentCapRoofTrussInsulationInsulationGuardCeilingRafterSupportCollarStormCollarRoofFlashing15feet(4.57m) MaximumVerticalVentingInteriorWallSurfaceInsulationMinimumClearancetoCombustiblesExteriorWallSurfaceIfinstalledonacarpetedsurfaceahearthisrequired Figure 28: Wall Framing Hole for Vertical Installation. Figure 29: Vertical Installation. 2 elbow strap down to the roof level, as shown in Figure 30. Tighten the clamp around the pipe section. Use a level to make sure the pipe is truly vertical. With roofing nails, secure the support straps to the roof. Seal the nails holes heads with non-hardening mastic. Trim the excess length of the support straps that extend out beyond the edge of the flashing. 7. Slip the flashing over the pipe section protruding through the roof. Secure the base of the flashing to the roof with roofing nails. Use a non-hardening sealant between the uphill edge of the flashing and the roof. Insure the roofing material overlaps the top edge of the flashing as shown in Figure 30. Verify that you have at least the minimum clearance to combustibles at the roof line. 8. Continue to add pipe sections until the height of the vent cap meets the minimum code requirements. Refer to Figure 31 and Table 5. Note that for steep roof pitches, the vent height must be increased. In high wind conditions, nearby trees, adjoining roof lines, steep pitched roofs, and other similar factors can result in poor draft, or down drafting. In these cases, increasing the vent height may solve the problem. 9. Slip the storm collar over the pipe, and push it down to the top of the roof flashing as shown in Figure 30. Use the non-hardening sealant around the joint between the pipe and the storm collar. 10. Twist-lock the vent cap. Initial Installation QUALIFIED INSTALLERS ONLY VerticalTerminationStormCollarFlashingRoofingnailsElbowStrap Figure 30: Vertical Vent Termination Installation. Table 5: Minimum ‘H’ for Figure 31. Roof Pitch Minimum Height Feet Meters Flat to 7/8 1 0.3 Over 7/12 to 8/12 1.5 0.46 Over 8/12 to 9/12 2 0.61 Over 9/12 to 10/12 2.5 0.76 Over 10/12 to 11/12 3.25 0.99 Over 11/12 to 12/12 4 1.22 Over 12/12 to 14/12 5 1.52 Over 14/12 to 16/12 6 1.83 Over 16/12 to 18/12 7 2.13 Over 18/12 to 20/12 7.5 2.29 Over 20/12 to 21/12 8 2.44 Figure 31: Height of Vertical Termination; Reference Table 5. 2 NOTES: (a) If an offset is necessary in the attic to avoid obstructions, it is important to support the vent pipe every 3 feet (91 cm), to avoid excessive stress on the elbows, and possible separation. Wall straps are available for this purpose (see Figure 32). (b) When ever possible, use 45° degree elbows instead of 90° degree elbows. The 45° degree elbow offers less restriction to the flow of flue gases and intake air. (c) For multi story installations. A ceiling firestop is required at the second floor, and any subsequent floors (see Figure 33). The opening should be framed to 10” (25.4 cm) x 10” (25.4 cm) inside dimensions, in the same manner as shown in Figure 28. (d) Any occupied areas above the first floor, including closets and storage spaces, which the vertical vent passes through, must be enclosed. The enclosure may be framed and sheet rocked with standard building materials. However consult the appliance manufactures installation ins...