Venting - Bradford White Brute BNTH Installation And Operation Instructions Manual

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12" (300mm) of the top of the enclosure, shall be permitted.
The opening shall directly communicate with the outdoors
or shall communicate through a vertical or horizontal
duct to the outdoors or spaces that directly communicate
with the outdoors and shall have a minimum free area of
1 square inch per 3000 Btu/hr (734 square mm/kW) of the
total input rating of all equipment located in the enclosure.
This opening must not be less than the sum of the areas of
all vent connectors in the confined space.
Other methods of introducing combustion and ventilation air
are acceptable, providing they conform to the requirements
in the applicable codes listed above.
In Canada, consult local building and safety codes or, in
absence of such requirements, follow CAN/CSA B149.
Ducted Combustion Air
The combustion air can be taken through the wall, or
through the roof. When taken from the wall, it must be
taken from out-of-doors by means of the Bradford White
horizontal wall terminal, shown in Table 3a and 3b. See
Table 2 to select the appropriate diameter air pipe. When
taken from the roof, a field-supplied rain cap or an elbow
arrangement must be used to prevent entry of rain water.
(See Figure10.)
Use ABS, PVC, CPVC or galvanized pipe for the
combustion air intake. (See Table 4.) The pipe should be
sized per Table 2. Route the intake to the boiler as directly
as possible. Seal all joints. Provide adequate hangers.
The unit must not support the weight of the combustion air
intake pipe. Maximum linear pipe length allowed is shown
in Table 2. Subtract 5 allowable linear ft. (1.5m) for every
elbow used.
The connection for the intake air pipe is at the top of the
unit. (See Figure 9.)
In addition to air needed for combustion, air shall also be
supplied for ventilation, including air required for comfort
and proper working conditions for personnel. Refer to the
applicable codes.

3.2 Venting

WARNING
Failure to use polypropylene CPVC or stainless steel
venting for the first 20" (285-600) / 30" (199 / 210)
of vent material or for any part of the venting that is
installed inside a closet may lead to property damage,
personal injury or death. The proper length of this
material is supplied with boiler. Boilers in the U.S. may
use pipe included with the boiler.
MATERIAL
Stainless Steel
PVC, sch 40
CPVC, sch 40
Polypropylene
Figure 11. Required Exhaust Vent Material
INSTALLATION STANDARDS
UNITED STATES
UL 1738
ANSI/ASTM D1785
ANSI/ASTM F441
ULC-S636
Failure to use the appropriate vent material, installation
techniques, glues/sealants could lead to vent failure
causing property damage, personal injury or death.
All venting must be installed according to this manual
and any other applicable local codes, including but
not limited to, ANSI Z223.1/NFPA 54, CSA B149.1,
CSAB149.2 and ULC-S636. Failure to follow this manual
and applicable codes may lead to property damage,
severe injury, or death.
The flue temperature of the Brute changes
dramatically with changes in operating water
temperature. Therefore, it is necessary to assess
the application of the boiler to determine the
required certified vent class. If the Brute is installed
in an application where the ambient temperature
is elevated, and/or installed in a closet/alcove,
polypropylene, CPVC or stainless steel material is
required. If the system temperatures are unknown at
the time of installation, Class IIB or higher venting
material is recommended.
The Brute is a Category IV appliance and may be installed
with PVC and CPVC that complies with ANSI/ASTM D1785
F441, polypropylene that complies with ULC-S636 Class
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In Canada, refer to CAN/CSA B199.1
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Figure 10. Combustion Air and Vent Through Roof
Venting must be ULC-S636 certified for use as
venting material. The venting material class must be
chosen based upon the maximum flue gas temperature
and the intended application of the boiler.
B W
RADFORD HITE
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CANADA
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