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701.7 Combination Indoor and Outdoor Combustion Air
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The use of a combination of indoor and outdoor combustion
air shall be in accordance with Section 701.7.1
through Section 701.7.3. [NFPA 54:9.3.4] (see Appendix F
for example calculations)
Where used, openings connecting
the interior spaces shall be in accordance with
Section 701.5. [NFPA 54:9.3.4(1)]
Outdoor openings shall
be located in accordance with Section 701.6. [NFPA 54:
9.3.4(2)]
The outdoor
opening(s) size shall be calculated in accordance with the
following:
- The ratio of interior spaces shall be the available volume of all communicating spaces divided by the required volume.
- The outdoor size reduction factor shall be one minus the ratio of interior spaces.
- The minimum size of outdoor opening(s) shall be the full size of outdoor opening(s) calculated in accordance with Section 701.6, multiplied by the reduction factor. The minimum dimension of air openings shall not be less than 3 inches (76 mm). [NFPA 54:9.3.4(3)]
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