21
VENTING (continued)
EXHAUST VENTING
N e v e r o p e r a t e s e p a r a t e d
combustion duct furnaces without combustion
air and fl ue gas piping in place or severe personal
injury or death may occur!
CARBON MONOXIDE! Your venting
system must not be blocked by any snow, snow
drifts, or any foreign matter. Inspect your venting
system to ensure adequate ventilation exists at
all times! Failure to heed these warnings could
result in Carbon Monoxide Poisoning (symptoms
include grogginess, lethargy, inappropriate
tiredness, or fl u-like symptoms).
1. In the United States, vent system installation must be
in accordance with the latest edition of ANSI Z223.1
(NFPA 54) National Fuel Gas Code. In Canada,
installation must be in accordance with CSA-B149.1
“Installation Code for Natural Gas Burning Appliances
and Equipment” and CSA-B149.2 “Installation Code
for Propane Burning Appliances and Equipment.”
2. A Breidert Type L or Fields Starkap, furnished by the
customer, must be installed at the termination point
of the vent system. See Figures 9A and 9B.
3. Each duct furnace MUST have its own vent system.
It MUST NOT be connected to other vent systems or
to a chimney.
4. Use UL 1738 listed single wall pipe for the vent
system. For installations in Canada, use UL S636
listed vent pipe conforming with local building codes,
or in the absence of local building codes, with current
CSA-B149.1 “Installation Codes for Natural Gas
Burning Appliances and Equipment” or CSA-B149.2,
“Installation Codes for Propane Gas Burning
Appliances and Equipment.”
Never use pipe of a diameter other
than that specifi ed in Table 1! Never use PVC,
ABS, or any other non-metallic pipe for venting!
To do so may result in serious damage to the unit
and/or severe personal injury or death!
5. Any run of single wall vent pipe passing through an
unheated space must be insulated with an insulation
suitable to 550°F (288°C).
6. The vent system must be installed to prevent
collection of condensate. Pitch horizontal pipes
downward 1/4 inch per foot (21mm/m) towards the
vent cap to facilitate drainage. Vertical vent pipes
should be piped as depicted in Figure 9A.
7. The equivalent length of the vent system must not
be less than 5 feet (1.5m) and must not exceed 50
feet (15.2m). Equivalent length equals the total length
of straight pipe plus 10 feet (3.05m) for each 90
degree elbow and 4 feet (1.22m) for each 45 degree
elbow.
8. For horizontal combustion air systems longer than
5 feet (1.5m), the system must be supported from
overheard building structures at 4 feet (1.22m)
maximum intervals in the United States and at 3 feet
(1m) maximum intervals in Canada.
9. The exhaust vent system must remain at a minimum
distance of 6 inch (152mm) from all combustible
materials. Any part of the vent system that passes
through a combustible material must be properly
insulated.
NOTICE: Increasing the clearance distances may be
necessary if there is a possibility of distortion or
discoloration of adjacent materials.
For a VERTICAL vent pipe section that passes through
a fl oor or roof, an opening 4 inch (102mm) greater in
diameter is required. The opening must be insulated and
fl ashed in accordance with applicable installation codes.
Also see Figures 10A and 11A.
A HORIZONTAL section of an exhaust vent system that
passes through a combustible wall must be constructed
and insulated as shown in Figures 10B and 11B.
