Bradford-White Corp BWCV User Manual

Internet Version for Reference Only

Page 6

Copper Brute II

Page 7

the outdoors through horizontal ducts, each opening 

shall have a minimum free area of not less than 

1 square inch per 2000 Btu/hr (11 square cm/kW) of 

total input rating of all equipment in the enclosure. 

Table 3 shows data for this sizing method, for each 

Copper Brute II model.

Method 2: One permanent opening, commencing 

within 12 inches (30 cm) 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 (7 square cm/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 CSA 

B149.1.

                                               Each Opening*
     Model               Square inches                Square cm
       500                         125                              807
       750                         188                             1213
      1000                        250                             1613
      1250                        313                             2020
      1500                        375                             2420
      1750                        438                             2826
      2000                        500                             3226

*Net Free Area in Square Inches / Square cm

Area indicated is for one of two openings; one at floor level and 

one at the ceiling, so the total net free area could be double the 

figures indicated.
This chart is for use when communicating directly with the 

outdoors. For special conditions and alternate methods, refer to 

the latest edition of ANSI Z223.1.
Note:  Check with louver manufacturers for net free area of 

louvers. Correct for screen resistance to the net free area 

if a screen is installed. Check all local codes applicable to 

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 (see Table 1). 

When taken from the roof, a field-supplied rain cap or 

an elbow arrangement must be used to prevent entry of 

rain water (see Figure 2).

    Use single-wall galvanized pipe, per Table 

4, for the combustion air intake (see Table 1 for 

appropriate size). Route the intake to the heater as 

directly as possible. Seal all joints with tape. Provide 

adequate hangers. The unit must not support the 

weight of the combustion air intake pipe. Maximum 

linear pipe length allowed is 50 feet (15.2m). Three 

elbows have been calculated into the 50-foot (15.2m) 

linear run. Subtract 10 allowable linear feet (3.0m) for 

every additional elbow used (see Table 1). When fewer 

than 3 elbows are used, the maximum linear pipe 

length allowed is still 50 feet (15.2m).

     Term                                   Description
      Pipe          Single-wall galvanized steel pipe, 24 gauge

                       minimum (either insulated or non-insulated)
      Joint              Permanent duct tape or aluminum tape

    Sealing

The connection for the intake air pipe is on 

the filter box. The heaters may have venting and 

combustion air ducting attached to the top or the back. 

They are shipped with the connections at the top. For 

attaching either or both pipes to the back, the mounting 

flanges are reversible by removing the mounting 

screws and orienting the flanges in the desired 

position. Replace the screws after positioning flanges. 

Run a bead of silicone around the collar and slide the 

pipe over the collar. Secure with sheet metal screws.

In addition to air needed for combustion, air 

shall also be supplied for ventilation, including all air 

required for comfort and proper working conditions 

for personnel. The Copper Brute II loses less than 1 

percent of its input rating to the room, but other heat 

sources may be present.