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HORIZONTAL INSTALLATION REQUIREMENTS
•
When venting through a sidewall, terminate the system not less than 12"
(.3m) above the ground and above the snow line in geographical areas
where snow accumulates. The termination area must be kept clear of
snow and ice at all times. See Figure 1.
•
Terminate the system at least 7' (2.1m) above a public walkway or
driveway, no less than 6' (1.8m) from the combustion air intake of any
appliance or 3' (.9m) from any other building opening, gas utility meter,
service regulator or the like. Less distance is permitted if specified in
the appliance's installation instructions. It also shall terminate at least
3' (.9M) above any forced air inlet within 10' (3.1m) and shall terminate
at least 4' (1.2m) below, 4' horizontally from, or 1' (.3m) above any door,
window, or gravity air inlet into any building as provided in the National
Fuel Gas Code ANSI Z223.1 and NFPA 54. See Figure 1. Proper judgment
may require greater distances depending on the side of the equipment
installed or to allow for snow drifting or falling from falling from overhead
roofs or trees. The termination should be far enough away from trees,
shrubs, or decorative items to prevent damage.
•
The total horizontal vent length from the appliance flue collar to the outside
termination shall be in accordance with the appliance manufacturer's
instructions.
1 ft. above doors and windows
4 ft below any window
or fresh air inlet
1 ft. above ground or
snow line
Figure 1 - Horizontal Termination Requirements
6
4 ft. horizontally from door and
windows
7 ft above
public
walkways and
drives
Sidewalk
VERTICAL INSTALLATION REQUIREMENTS
1. The vent system must terminate at least 3 feet above the roof line and
at least 2 feet higher than any portion of the building within 10 feet.
See Figure 2. This limitation can be removed if an engineering analysis
demonstrates normal and safe operation of appliance.
2. When terminated at a height of more than 10 feet, the stack must be
supported by a Guy Section.
3. The vent system must terminate with one of the CAX1-(BC) terminations.
Except;
a) Category I appliances (natural draft) must use a Rain Cap. It is
optional on Category II. This limitation can be removed if an engineer-
ing analysis demonstrates normal and safe operation of appliance.
b) Vent systems without provisions for draining rain water must use a
Rain Cap.
c) Terminations or approved mechanical vent devices specified or
provided by the appliance manufacturer are permitted.
4. The total continuous distance of the vent system from the appliance flue
collar to the termination shall not exceed that specified in the appliance
manufacturer's installation instructions. When venting natural draft
appliances the termination must be at least 5 feet above the topmost draft
hood. Otherwise a listed mechanical draft inducing device is required.
This limitation can be removed if an engineering analysis demonstrates
normal and safe operation of appliance.
5. In cold climates do not install a condensate drain on the exterior of the
building. Doing so may result in dangerous icy conditions on surfaces near
the drain and may cause damage to the vent system and/or the building
exterior. Security Chimneys will NOT be held liable for any personal injury
or property damage due to any formation of ice.
6. Vertical supports are required after every transition to vertical. Vertical
supports are also required after every offset elbow.
7. Unless CAX1-(BC) is installed in a fire rated shaft, a roof thimble and
support is required when penetration fire rated floors, walls or ceilings.
10'
2'
2 ft. above structures within 10 ft.
Figure 2- Vertical Installation Requirements
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