Category I double wall vent (or equivalent) connectors and sized according to vent sizing tables (FAN column) in the latest edition of the National Fuel Gas Code.
The Category I vent and accessories, such as firestop spacers, thimbles, caps, etc., must be installed in accordance with the vent manufacturer’s listing. The vent connector and firestop must provide correct spacing to combustible surfaces and seal to the vent connector on the upper and lower sides of each floor or ceiling through which the vent connector passes.
Any improper operation of the common venting system in an existing building should be corrected when new equipment is installed, so the installation conforms to the latest edition of the National Fuel Gas Code, ANSI Z223.1.
When resizing any portion of the common venting system, it should be resized to approach the minimum size as determined using the appropriate tables in the National Fuel Gas Code.
The weight of the venting system must not rest on the water heater. The venting system must be adequately supported in compliance with local codes and other applicable codes.
Vent Terminations
The vent terminal should be vertical and exhaust outside the building at least 2 feet (0.6 m) above the highest point of the roof when within a 10 foot (3.05 m) radius.
Additionally, vertical terminations must be a minimum of 3 feet (0.9 m) above the roof line, and when less than 10 feet (3.05 m) from a parapet wall must be a minimum of 2 feet (0.61 m) higher than the parapet wall.
Vent caps should have a minimum clearance of 4 feet (1.2 m) horizontally from, and in no case above or below [unless a 4 feet (1.2 m) horizontal distance is maintained], electric meters, gas meters, regulators and relief equipment.
Maintain a distance of at least 3 feet
(0.9 m) above any forced air inlet within
10 feet (3.05 m) and a distance of at least 4 feet (1.2 m) below, 4 feet (1.2 m) horizontally from, or 1 foot (30 cm) above any door, window or gravity air inlet.
Do not terminate the vent in a window well, stairwell, alcove, courtyard or other recessed area. The vent can not terminate below grade. The bottom of the vent terminal shall be located at least 12 inches (30 cm) above grade and clear of snow, ice, leaves or other debris.
The distance of the vent terminal from adjacent public walkways, adjacent buildings, windows, and building openings
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