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7.3.2 Vertical or Horizontal Vent Termination
1. The vent terminal must have a minimum clearance of 4 feet (1.22 m) horizontally from, and in no case be located
above or below, electric meters, gas meters, regulators and relief equipment.
2. The vent cap must terminate at least 3 feet (0.91 m) above any forced air inlet within 10 feet (3.05 m).
3. The vent shall terminate at least 4 feet (1.22 m) below, 4 feet (1.22 m) horizontally from or 1 foot (0.3 m) above
any door, window or building air inlet to the building.
4. The vent system shall terminate at least 1 foot (0.3 m) above grade, at least 1 foot (0.3m) above highest possible
snow accumulation levels and shall terminate at least 7 feet (2.13 m) above grade when located adjacent to
public walkways or gathering areas.
5. To avoid a blocked flue condition, keep the vent cap clear of snow, ice, leaves, debris, etc.
6. The vent must not exit over a public walkway, near soffit vents or crawl space vents or other areas where
condensate or vapor could create a nuisance or hazard or cause property or could be detrimental to the
operation of regulators, relief valves or other equipment.
7. A horizontal vent must extend one foot beyond the wall.
8. A horizontal or vertical vent terminal must not be installed closer than 3 feet (0.91m) from an inside corner of an
L-shaped structure.
9. A vertical vent must exhaust outside the building at least 3 feet (0.91m) above the point of the exit and at least 2
feet (0.61 m) above the highest point of the roof within a 10-foot (3.05 m) radius of the termination.
10. A vertical termination less than 10 feet (0.91 m) from a parapet wall must be a minimum of 2 feet (0.61 m) higher
than the parapet wall
7.3.3 Combining Category III or Category IV Vents
Combined VT3 Category III or Category IV gas vent systems must incorporate an Exhausto, Tjernlund or U.S.
Draft variable speed, modulating, mechanical draft inducer capable of maintaining the appropriate negative draft
at the end of the common flue, to assure that all boilers in the combined vent system operate with a negative
draft. Do not exceed negative 0.25” W.C. See “Combining Vents with a Draft Inducer” illustration below.
WARNING: Do not connect multiple boiler vents into a single unpowered or fixed speed powered vent.
This could cause unsafe operation and the potential for poisonous carbon monoxide to enter occupied
areas. Such improper installation can cause property damage, personal injury, exposure to hazardous
materials or death.
WARNING: Do not combine appliances utilizing Category I or Category II venting into the same vent
system with appliances utilizing Category III or Category IV venting. This could cause unsafe operation
and the potential for poisonous carbon monoxide to enter occupied areas. Such improper installation can
cause property damage, personal injury, exposure to hazardous materials or death.
Conventional Venting Through the Wall Venting Combining Vents with a Draft Inducer
(40 paginas)
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