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A single length of double wall Type B vent pipe must be used to go through the concentric vent box and outside wall to the vent terminal. 5. Any run of single wall vent pipe passing through an unheated space must be insulated with an insulation suitable to 550° F. 6. The vent system must be installed to prevent collection of condensate. Pitch horizontal pipes downward 1/4 inch per foot (21mm per meter) toward the vent cap to facilitate drainage. Vertical vent pipes should be piped as depicted in Figure 22. 7. The equivalent length of the vent system must not be less than 5 feet (1.5m) and must not exceed 30 feet (9m). The equivalent length equals the total length of straight pipe plus 5 feet (1.5m) for each 90° elbow and 2.5 feet (0.76m) for each 45° elbow. 8. Each slip joint must be secured with at least three corrosion resistant screws. Two full turns of 3M #425 Aluminum Foil NOTICE: Increasing the clearance distances may be necessary if there is a possibility of distortion or discoloration of adjacent materials. 11. The top of a VERTICALLY VENTED exhaust system must extend at least 3 feet (0.91m) above the roof surface that it passes through. See Figure 22. 12. The point of termination for a HORIZONTALLY VENTED exhaust system must be at least 12 inches (0.3m) from the exterior of the wall that it passes through. In addition, the termination point must be at least 1 foot (0.3m) above grade or above the snow line, more than 6 feet (1.8m) from the combustion air inlet of another appliance, at least 4 feet (1.2m) below, 4 feet (1.2m) horizontally from, or 1 foot (0.3m) above any door, window or gravity air inlet into any building, and more than 3 feet (0.91m) from and not directly above, any gas meter or service regulator. See Figures 23 and 24 and Table 4. Table 6 - Concentric Vent Box Dimensions UnitSize Dimensions - Inches (Nominal) A B C D E G 30 41/2 4 6 8 5 12 45 60 75 9051/2 5 8 12 5 15105 120 tape or its equivalent must then be used Figure 20 - Concentric Vent Box to seal each joint. High temperature silicone sealant may be used instead of the tape. Silicone sealant must be used to seal the joint between the Type B vent pipe and the single wall pipe. 9. For horizontal vent systems longer than 5 feet (1.5m), the system must be supported from overhead building structures at 4 foot (1.2m) intervals in the U.S. and at 3 foot (0.91m) intervals in Canada. 10. The exhaust vent system must remain at a minimum distance of 1 inch (25mm) from all combustible materials. Any part of the vent system that passes through a combustible material must be properly insulated. 27 28 Figure 22 - Vertical Intake/Vent Installation Figure 21 - Concentric Vent Installation VENTING (continued) Figure 23 - Horizontal Intake/Vent Installation Figure 24 - Horizontal Intake/Vent Installation Vent Terminal (1.8M Min.) Adjacent Building D 3330 6'-0" Min. (0.9M Min.) 3'-0" Min. Building Overhang 29 SEPARATED COMBUSTION VENTING (continued) AIR INLET COLLAR Remove screen and mounting plate from air inlet on rear panel of unit by removing 4 screws. Secure inlet collar and gasket to inlet opening re-using the 4 screws removed in step one. EXHAUST AIR COLLAR Secure 5-4” reducer to flue collar on rear panel of unit sizes 090, 105 and 120. Seal per exhaust venting instructions. VERTICAL TERMINATION Select location on roof for vent terminal, ensuring adequate space inside the building/structure for concentric vent box. Terminal must be at least 6 feet (1.8m) from any wall or adjoining building. See Figure 22. Cut a hole through the roof for combustion air pipe. Concentric vent box is to be suspended from the underside of the roof using suitable brackets (field supplied). Before mounting box, cut a length of 6 inch (152mm) (sizes 030-075) or 8 inch (203mm) (sizes 090-120) pipe so that dimension A, Figure 22, is equal to the dimension from the top of the box to the roof surface plus 20 inches or plus maximum expected snow depth, whichever is greater. Fasten pipe to combustion air inlet connection of concentric vent box and seal joint. Insert pipe through roof and fasten vent box in place. Flash and/or caulk pipe to roof. Install inlet air screen assembly and fasten to pipe with screws. Insert a 5 foot length of Type B vent pipe through the concentric vent box opening (detail A, Figure 20) with the "UP" arrow pointing up. Position the pipe to extend 12 inches beyond the inlet air screen. Secure the Type B vent pipe in position by drilling three small equally spaced holes through the collar of the concentric vent box and inserting sheet metal screws. Install deflector disk on Type B vent pipe 2-1/2 inches above inlet air screen and fasten with screws. Seal joint between deflector disk and pipe with silicone sealant. Install vent terminal on top of Type B vent pipe, fasten with screws and seal joint. Connect flue pipe and combustion air pipe from concentric vent box to unit, following instructions on pages 26 and 27. Joint between Type B vent pipe...

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