PB Heat DE User Manual download pdf (Page 6)

ii. Where communicating with the outdoors

through horizontal ducts, each opening shall

have a minimum free area of 1 in

per 2000

Btu/hr (22 cm

per 2000 W) of total rated

input for all appliances in the space. See

Figure 1.5.

b. One Permanent Opening Method: Provide

one permanent opening beginning within 12

inches (305 mm) of the top of the space. The

opening shall communicate directly with the

outdoors, communicate through a vertical or

horizontal duct, or communicate with a space

that freely communicates with the outdoors. The

openings shall have a minimum free area of 1 in

per 3000 Btu/hr of total rated input for all

appliances in the space and not less than the

sum of the cross-sectional areas of all vent

connectors in the space. The gas fired equipment

shall have clearances of at least 1 inch (25 mm)

from the sides and back and 6 inches (150 mm)

from the front of the appliance. See Figure 1.6

for this arrangement.

5. Combination Indoor and Outdoor Combustion Air:

If the required volume of indoor air exceeds the

available indoor air volume, outdoor air openings or

ducts may be used to supplement the available

indoor air provided:

a. The size and location of the indoor openings

comply with Subsection 3.

b. The outdoor openings are to be located in

accordance with Subsection 4.

c. The size of the outdoor openings are to be sized

as follows:

where:

req

= minimum area of outdoor openings.

full

= full size of outdoor openings calculated

in accordance with Subsection 4.

avail

= available indoor air volume

req

= required indoor air volume

6. Engineer

ed Installations: Engineered combustion air

installations shall provide an adequate supply of

combustion, ventilation, and dilution air and shall be

approved by the authority having jurisdiction.

7. Mechanical Combustion Air Supply

a. In installations where all combustion air is

provided by a mechanical air supply system, the

combustion air shall be supplied from the

outdoors at the minimum rate of 0.35 ft

/min per

1000 Btu/hr (0.034 m

/min per 1000 W) of the

total rated input of all appliances in the space.

b. In installations where exhaust fans are installed,

additional air shall be provided to replace the

exhaust air.

avail

1 –

req

= A

full

⎛

⎜

⎝

⎛

⎜

⎝

Figure 1.5: Air Openings – All Air from Outdoors

through Horizontal Ducts

Figure 1.6: Air Openings – All Air from Outdoors

through One Opening

Figure 1.4: Air Openings – All Air from Outdoors

through Vertical Ducts

PREINSTALLATION

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PB Heat DE User Manual Page 6

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