// CODE SNIPPET
506.7.7 Reduced Clearance
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Where clearance is reduced
by using an air gap between the combustible surface and
the selected means of protection, air circulation shall be
provided by one of the methods in accordance with Section
506.7.7.1 through Section 506.7.7.3. [NFPA 91:4.6.4.7]
Air circulation shall be
permitted to be provided by leaving edges of the
wall protecting system open with not less than a 1 inch (25.4 mm) air gap.
[NFPA 91:4.6.4.7.1]
Where the means for protection is mounted on a single flat wall away from
corners, air circulation shall be permitted to be
provided by one of the following:
- Leaving the top and bottom edges open to circulation by maintaining the 1 inch (25.4 mm) air gap.
- Leaving the top and both side edges open to circulation by maintaining the 1 inch (25.4 mm) air gap. [NFPA 91:4.6.4.7.2]
Thermal shielding that covers two walls in a corner
shall be permitted to be open at the top and bottom
edges with not less than 1 inch (25.4 mm) air gap.
[NFPA 91:4.6.4.7.3]
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