Installation: Piping
GMND-SVX01B-EN
19
1.
The combustion air system installation must be in
accordance with the latest edition of (N.F.P.A. 54) ANSI
Z223.1 National Fuel Gas Code. In Canada, installation
must be in accordance with CGA-B149.1 “Installation
Code for Natural Gas Burning Appliances or
Equipment” and CGA-B149.2 “Installation Code for
Propane Burning Appliances and Equipment”.
2. A Breidert Type L or Fields inlet cap, furnished by the
customer, must be installed at the termination point of
the combustion air system (see
Figure 9, p. 21
and
Figure 10, p. 21
).
Note:
The top of the inlet cap is to be no less than
12 inches (305 mm) from the top of the exhaust
vent cap (see
Figure 9, p. 21
and
Figure 10,
p. 21
).
3. Use single wall pipe constructed of 26 gauge
galvanized steel or a material of equivalent durability
and corrosion resistance for the combustion air
system. For installation in Canada, use pipe
constructed from 0.025-inch thick aluminum or 0.018-
inch thick stainless steel.
4. Long runs of single wall combustion air piping passing
through an unheated space may require insulating if
condensation becomes noticeable.
5. The combustion air system must be installed to
prevent collection of condensate. Pitch horizontal
pipes downward 1/4 inch per foot (21 mm/m) toward
the inlet cap to facilitate drainage. Vertical combustion
air pipes should be arranged as depicted in
Figure 9,
p. 21
.
6. The equivalent length of the combustion air system
must not be less than five feet (1.5 m) and must not
exceed 50 feet (15.2 m). Equivalent length equals the
total length of straight pipe, plus 15 feet (4.6 m) for
each 90-degree elbow and five feet (1.5 m) for each
45-degree elbow.
Note:
For optimum performance, keep the
combustion air system as straight as possible.
7.
Each slip joint must be secured with at least three
corrosion resistant screws. Two full turns of 3M™ #425
Aluminum Foil Tape or its equivalent must then be
used to seal each joint. General Electric RTV-108, Dow
Corning
®
RTV-732 or an equivalent may be used
instead of the tape.
8. For horizontal combustion air systems longer than five
feet (1.5 m), the system must be supported from
overhead building structures at three-foot (1-m)
intervals.
Exhaust Venting
1.
Vent system installation must be in accordance with
the latest edition of (N.F.P.A. 54) ANSI Z223.1 National
Fuel Gas Code. In Canada installation must be in
accordance with CGA-B149.1 “Installation Code for
Natural Gas Burning Appliances and Equipment” or
CGA-B149.2 “Installation Code for Propane Burning
Appliances and Equipment”.
2. A Breidert Type L or Fields vent cap, furnished by the
customer, must be installed at the termination point of
the vent system (see
Figure 9, p. 21
and
Figure 10,
p. 21
).
3. Use single wall pipe constructed of 26 gauge
galvanized steel or a material of equivalent durability
and corrosion resistance for the vent system. For
installations in Canada, use corrosion resistant and
gas-tight, listed vent pipe conforming with local
building codes, or in the absence of local building
codes, with current CAN/CGA-B149.1, “Installation
Codes for Natural Gas Burning Appliances and
Equipment” or CAN/CGA-B149.2, “Installation Codes
for Propane Gas Burning Appliances and Equipment”.
WARNING
Risk of Fire and Carbon Monoxide
Poisoning with Improper Piping!
Never use pipe of a diameter other than that specified
in
Table 1, p. 10
(“D” dia. flue opening)! To prevent pipe
from melting and introducing exhaust fumes into the
air supply, never use PVC, ABS or any other non-
metallic pipe for venting! Failure to follow these
recommendations could result in death or serious
injury or equipment damage.
WARNING
Carbon Monoxide!
Never operate duct furnaces without combustion air
and flue gas piping in place. Each unit MUST have its
own combustion air system and MUST NOT be
connected to other vent systems or to a chimney. 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 follow these recommendations could
result in death or serious injury.
WARNING
Risk of Fire and Carbon Monoxide
Poisoning with Improper Piping!
Never use pipe of a diameter other than that specified
in
Table 1, p. 10
(“D” dia. flue opening)! To prevent pipe
from melting and introducing exhaust fumes into the
air supply, never use PVC, ABS or any other non-
metallic pipe for venting! Failure to follow
recommendations could result in death or serious
injury or equipment damage.
