Combustion Air; Combustion Air From Room - Bradford White Brute MagnaTech BMGV1600 Installation And Operation Instructions Manual

Page 10
3.2

Combustion Air

Boilers and water heaters must have provisions for
combustion and ventilation air in accordance with the
applicable requirements for Combustion Air Supply
and Ventilation in the National Fuel Gas Code, ANSI
Installation Code, CSA B149.1. All applicable
provisions of local building codes must also be
adhered to.
A Units can take combustion air from the space
in which it is installed, or the combustion air can
be ducted directly to the unit. Ventilation air must
be provided in either case.
3.2.1

Combustion Air From Room

In the United States, the most common requirements
specify that the space shall communicate with the
outdoors in accordance with Method 1 or 2. (See the
following descriptions.) Where ducts are used, they
shall be of the same cross-sectional area as the free
area of the openings to which they connect.
Method 1: Two permanent openings, one
commencing within 12" (300 mm) of the top and
one commencing within 12" (300 mm) of the bottom,
of the enclosure shall be provided. The openings
Screen for horizontal galvanized air pipe
Screen for horizontal PVC air pipe
Screen for horizontal polypropylene air pipe
Screen for vertical galvanized air pipe
Screen for vertical PVC air pipe
Screen for vertical polypropylene air pipe
Table 5. Ducted Air Accessories
Material
ABS
PVC, sch. 40
CPVC, sch. 40
Single wall galv. steel
Polypropylene
Table 6. Required Combustion Air Pipe Material
Model 1600 Model 2000
D2012104 D2012101
CA012004 CA012001
CA012204 CA012201
D2012204 D2012201
CA012404 CA012401
CA012604 CA012601
United States
ANSI/ASTM D1527
ANSI/ASTM D1785 or D2665
ANSI/ASTM F441
26 gauge
ULC S636 Class 2C
shall communicate directly, or by ducts, with the
outdoors or spaces that freely communicate with
the outdoors. When directly communicating with the
outdoors, or when communicating to the outdoors
through vertical ducts, each opening shall have a
minimum free area of 1 square inch per 4000 Btu/
hr (550 square mm/kW) of total input rating of all
equipment in the enclosure. When communicating
to the outdoors through horizontal ducts, each
opening shall have a minimum free area of not less
than 1 square inch per 2000 Btu/hr (1100 square
mm/kW) of total input rating of all equipment in the
enclosure.
Method 2: One permanent opening, commencing
within 12" (300 mm) 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
Model 2500 Model 3000
D2012101 D2012102
CA012001 CA012002
CA012201 CA012202
D2012201 D2012202
CA012401 CA012402
CA012601 CA012602
Canada
The air pipe material must be chosen based upon
the intended application of the boiler or water
heater, and must be installed according to the vent
manufacturer's installation instructions.
Model 3500 Model 4000
D2012103 D2012103
CA012003 CA012003
CA012203 CA012203
D2012203 D2012203
CA012403 CA012403
CA012603 CA012603