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2
Venting
General information
You must supply adequate combustion and ventilation air to this unit. You must provide minimum clearances for the vent
terminal from adjacent buildings, windows that open, and building openings. Follow all requirements set forth in the latest edition
of the National Fuel Gas Code, ANSI Z223.1, in Canada, the latest edition of CAN/CGA Standard B149 Installation Code for Gas
Burning Appliances and Equipment or applicable local building codes. Vent installations for connection to gas vents or chimneys
must be in accordance with Part 7, "Venting of Equipment" of the above-mentioned standards.
Examine the venting system at least once each year. Check all joints and vent pipe connections for tightness.
NOTICE
Also check for corrosion or deterioration. If you find any problems, correct them at once.
Failure to use correct venting materials can result in loss of life from flue gas spillage into working or living
⚠
DANGER
space.
Vent system must be gas tight sealed to the appliance vent outlet (i.e., silicone) for all venting configurations.
Failure to follow this warning can cause flue products to leak into the cabinet causing damage to the appliance
and can result in gas spillage into the living or work space causing personal injury or death. See FIG. 2-5.
Venting support
Support horizontal portions of the venting system to prevent sagging. Provide an upward slope of at least 1/4 inch per foot
(21mm/m) on all horizontal runs from the unit to the vertical flue run or to the vent terminal on sidewall venting installations.
Do not use an existing chimney as a raceway if another appliance or fireplace is vented through the chimney. A water heater shall
not be connected to a chimney flue serving a separate appliance designed to burn solid fuel. The weight of the venting system must
not rest on the unit. Provide adequate support of the venting system. Follow all local and applicable codes. Secure and seal all vent
connections. Follow the installation instructions from the vent material manufacturer.
Vertical vent termination clearances and location
The vent terminal should be vertical and exhaust outside the building at least 2 feet (0.61m) above the highest point of the roof
within a 10 foot (3.05m) radius of the termination.
The vertical termination must be a minimum of 3 feet (0.91m) above the point of exit.
A vertical termination less than 10 feet (3.05m) from a parapet wall must be a minimum of 2 feet (0.61m) higher than the parapet
wall.
You must locate the air inlet termination elbow at least 12'' (30cm) above the roof or above normal snow levels.
Keep the vent cap clear of snow, ice, leaves, and debris to avoid blocking the flue.
Figure 2-1_Vent termination from peaked roof - 10 ft. or
less from ridge
Vent terminations are not shown in FIG.'s 2-1 thru 2-4. Make sure all vertical vents are installed with vent
NOTICE
terminations recommended by the vent manufacturer.
16
Installation & Service Manual
Figure 2-2_Vent termination from peaked roof - 10 ft. or
more from ridge
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