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PV500-46U 06/12
8. The solid CPVC vent pipe (Plastic venting is not allowed for models with “SANI” in the model number) must be
sealed to the wall or roof at the point where it passes through the wall or roof, to prevent rain, insects or flue
products from entering the living space.
9. For proper vent operation and to protect the gas vent from wind and weather, attach to the outdoor end of the
vent the UL listed vent termination supplied with the Power VT Plus water heater. This termination is required
for proper operation and no substitution is allowed.
10. Do not use a barometric damper with the Power VT Plus positive pressure vent.
9.5 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, unless a 4 foot (1.22 m) horizontal distance is maintained from 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 and at least 1 foot (0.3m) above 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 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.
9.6 Combining Category IV Vents
Combined Power VT Plus Category IV gas vent systems must incorporate an Exhausto or Tjernlund variable speed,
modulating, mechanical draft inducer capable of maintaining the appropriate negative draft at the end of the
common flue, to assure that all water heaters 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 water heaters 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 loss of life.