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5. Seal all vent pipe joints and seams to prevent leakage. Use General Electric RTV-108, Dow- Corning RTV-732, or equivalent silicone sealant with a temperature rating of 500 deg. F, or 3M # 425 aluminum foil tape (or equivalent). The vent system must be installed to prevent collection of condensate. Pitch or 3M #425 aluminum foil tape (or equivalent). 7. Avoid running vent pipe through unheated spaces. When this cannot be avoided, insulate the pipe to prevent condensation of moisture on the walls of the pipe. Insulate vent pipe runs longer than 10 ft (3m). Insulation should be a minimum of 1/2" (12.7 mm) thick foil faced. Figure 12 horizontal pipes downward 1/4 inch per foot (21mm per meter) toward the outlet for condensate drainage. Install a tee with a condensate drain at the low point of the pipe (see Figure 13). As an alternate, a 3/8 inch diameter hole may be drilled at the low point of the pipe for condensate drainage. 6. Horizontal portions of the venting system shall be supported at minimum intervals of 4 feet (1.2m) to prevent sagging (in Canada, support at 3 foot (1m) minimum intervals). 8. Avoid running vent pipe through unheated spaces. When this cannot be avoided, insulate the pipe to prevent condensation of moisture on the walls of the pipe. 18 Table 5 - Category I Horizontal Venting Requirements - Standard Combustion Unit Size Vent Diameter (in) Maximum Number Elbows * Maximum Horizontal Vent Length (Ft.) Minimum Vertical Rise (In.) Extension Distancefrom Wall (In.) 30 4 4 1 2 5 10 8 18 36 36 45 4 4 4 1 1 2 10 15 5 24 24 24 36 36 36 60 4 2 10 18 36 75 5 2 7 24 36 90 5 2 7 24 24 105 5 2 7 24 24 120 5 5 1 2 5 7 24 24 24 24 *One elbow is required to make the vertical extension, See Figure 13. Figure 13 - Category I Horizontal Venting Requirements D6838C 19 Figure 14 - Vent Support D- 06839A 20 STANDARD COMBUSTION HORIZONTALLY VENTED, CATEGORY III - Figure 15 Vent Systems Termination Clearance Requirements Structure Minimum Clearances for Termination Locations 4 feet below Door, window or any gravity air inlet 4 feet horizontally 1 foot above Forced air inlet within 10 ft. 3 feet above Adjoining building or parapet 6 feet Adjacent public walkways 7 feet above grade Observe the following precautions when venting the unit: 1. Use flue pipe of the same size as the flue connection(s) on the gas unit heater, 4" (102mm). All heaters must be vented with a single or double wall pipe listed for category III positive pressure vent systems. Type B double wall pipe can be used with limitations as shown in Figure 15B. As illustrated, a single 5 foot (1.52m) section of Type B vent pipe with a draft hood connector may be used between the appliance vent connection and the vent terminal. Use Metalbestos Type B gas vent with a Metalbestos 4RV-DH draft hood connector, or, an Amerivent Type B gas vent with an Amerivent 4EDC draft hood connector. 2. Each unit must have an individual vent pipe and vent terminal. Unit MUST NOT be connected to other vent systems or to a chimney. 3. Category III units are limited to a maximum of 40 feet (12.19m) equivalent length of vent pipe. Equivalent length is the total length of straight sections PLUS 5 feet (1.5m) for each 90 degree elbow and 2.5 feet (.75m) for each 45 degree elbow. 4. If using a single section of Type B vent pipe, seal the annular space between the inner and outer sections of the draft hood connector with a high temperature silicone sealant. Use General Electric RTV-108, Dow- Corning RTV-732, or equivalent silicone sealant with a temperature rating of 500 deg. F. See Figure 15C. Attach the draft hood connector to the appliance vent connection with screws (3 minimum) and seal the joint with silicone sealant. Install a Type B vent thimble in the wall. Insert the vent pipe through the thimble and attach it to the adapter on the appliance. Seal the joint with silicone sealant or two wraps of aluminum foil tape. Install a vent cap on the outlet pipe and secure with screws (3 minimum). 5. An Amerivent Americap or Metalbestos vent cap must be supplied by the customer for each power vented unit. The vent pipe diameter must be 4 inches (102mm). 6. Through the wall venting for these appliances shall not terminate over public walkways, or over an area where the condensate or vapor could create a nuisance, hazard, or could be detrimental to the operation of regulators, relief valves, or other equipment, see Figures 15A, 16 and 18. 7. The vent terminal must be at least 3 feet (1m) above grade, or in snow areas, at least 3 feet above the snow line to prevent blockage by snow. 8. The vent terminal must be at least 12 inches (305mm) from the exterior of the wall that it passes through to prevent degradation of the building materials by flue gasses. 9. Maintain 1-inch (25.4mm) clearance between the vent pipe and combustible materials. 10. Seal all vent pipe joints and seams to prevent leakage. Use General Electric RTV-108, Dow- Corning RTV-732, or equivalent silicone sealant wit...

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