Assessments - 1, GPA: 3
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Use a Listed roof flashing, roof jack, or roof thimble for all roof penetrations. Do not fill the space around the vent (that is, the clear air space in the thimble or firestop) with insulation. The roof opening must be located so that the vent is vertical. 6. Vent Termination – Vertical (See Figures 12A and 12B, page 13, for height of vent termination above the roof. See Table 7, Page 15, for Listed terminations.) Use a Listed vent terminal specified by local and national codes and your manufacturer’s instructions. A roof termination must be vertical. In Canada, the Vent Cap location shall have a minimum clearance of 4 feet (1.2M) horizontally from electric meters, gas meters, regulators, and relief openings. 7. Vent Termination – Horizontal (See Table 7). Use a listed wall thimble and vent terminal from Table 7. The terminal must be located (U.S.-See Figure 13): • at least 3" and at most 12" out from the wall (see Figure 14), following the vent manufacturer’s instructions. • at least 12" above finished grade or the normally expected snow accumulation level, whichever is higher • at least 4 feet below or horizontally from, or 1 foot above, any doors or windows or gravity air inlet to a building • At least 3 feet above any forced air inlet located within 10 feet • At least 4 feet horizontally from electric meters, gas meters, regulators and relief equipment • At least 7 feet above grade adjacent to walkways or similar traffic areas. Table 5: Recommended Special Gas Vents (Positive Pressure) Brand Manufacturer Material Type Sealant Saf-T Vent® 4” Special Gas Vent (Single Wall) Saf-T CI Vent® Special Gas Vent (Double Wall) Z-Vent 4” Special Gas Vent (Type BH), Model SVE Heat-Fab, Inc. 38 Hayward Street Greenfield, MA 01301 (800) 772-0739 Heat-Fab, Inc. 38 Hayward Street Greenfield, MA 01301 (800) 772-0739 Z-Flex U.S., Inc. 20 Commerce Park North Bedrford, NH 03110-6911 (800) 654-5600 Metal Metal Metal Consult Manufacturer Consult Manufacturer G.E. RTV 106 14 1' Min. 4' Min.4' Min. 4' Min. 4' Min. 3' Minimum clearance if horizontal distance to exhaust opening is less than 10 feet. Forced Air Inlet Vent Termination 1' Minimum above snow or finished grade (whichever is higher) At least 7' above grade adjacent to public walkways Vent Termination Vent Termination Gas Meter Max 12" Min 3" 1' Min. 4' Min.4' Min. 4' Min. 4' Min. 3' Minimum clearance if horizontal distance to exhaust opening is less than 10 feet. Forced Air Inlet Vent Termination 1' Minimum above snow or finished grade (whichever is higher) At least 7' above grade adjacent to public walkways Vent Termination Vent Termination Gas Meter Max 12" Min 3" FIGURE 13: U.S. minimum Exhaust Vent clearances. Local codes may differ - consult local code officials The terminal must be located (Canada): • at least 10 feet (3.3M) from any opening into a building. • at least 12" (.3M) above finished grade or the normally expected snow accumulation level, whichever is higher • At least 4 feet (1.2M) horizontally from electric meters, gas meters, regulators and relief equipment • At least 7 feet (2.1M) above grade adjacent to walkways or similar traffic areas. Allow at least three feet (1M) vertical clearance over vent termination when terminating under an overhang or deck. Avoid corners or alcoves where snow or wind could have an effect. Exhaust may affect shrubbery and some building materials. Keep shrubbery away from termination. To prevent staining or deterioration, sealing or shielding exposed surfaces may be required. Metal Vent Body 3" (7.6 cm) Min., 12" (30.5 cm)Max. Clearance Condensate drain w/Trap Condensate Tee Support weight of pipe Listed Terminal Metal Special Gas Vent requires Appliance Adapter Slope at least 1/4" per foot (2 cm per Meter) down towards condensate drain FIGURE 14: Typical Special Gas Vent Pipe Installation (Horizontal-Positive Pressure) 8. WARNING Fire Hazard. Do not run the heater vent into a common vent with any other appliance. Do not run the Special Gas Vent into, through, or within any active vent such as a factory built or masonry chimney. Table 6: Maximum Vent Length 4" Special Gas Vent (Vertical or Horizontal)* No. of 90° Elbows Maximum Length in Feet (M) 0 70 ft. (21.3M) 1 57 ft. (17.4M) 2 45 ft. (13.7M) 3 32 ft. (9.8M) 4 20 ft. (6.1M) * Minimum vent length is one foot (.34M), or in accordance with vent manufacturer’s instructions, and local and national codes. Horizontal vents 3’ (1M) or less in length do not require a condensate tee, but must slope down toward the outlet at 1/4” to the foot (2cm/M) to allow condensate to drain. Final Installation Check Check that horizontal vent pipe runs slope uniformly at least 1/4" per foot (2cm per meter) to condensate drain(s). No sags, no dips, no high or low spots. Check that vent is supported at elbows, tees, and horizontal and vertical runs according to manufacturer’s instructions and code requirements. Check that vent supports and wall and ceiling penetrations allow free movements up,...
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