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// CODE SNIPPET

506.7.7 Reduced Clearance

Los Angeles Mechanical Code > 5 Exhaust Systems > 506.0 Product-Conveying Ducts > 506.7 Duct Clearances > 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]

506.7.7.1 Wall Protector

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]

506.7.7.2 Single Flat Wall

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:
  1. Leaving the top and bottom edges open to circulation by maintaining the 1 inch (25.4 mm) air gap.
  2. 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]

506.7.7.3 Wall Protectors That Cover Two Walls

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]

Related Code Sections


506.7.7 Exhaust Systems, Reduced Clearance
Where clearance is reduced by using an air gap between the combustible surface and the selected means of protection, air circulation shall ...
Los Angeles Mechanical Code > 5 Exhaust Systems > 506.0 Product-Conveying Ducts > 506.7 Duct Clearances > 506.7.7 Reduced Clearance
506.10.3 Exhaust Systems, Reduced Clearance Permitted
for the specific hazard, the clearance shall be permitted to be reduced to 6 inches (152 mm) from combustible materials and 1 / 2 of an inch (12.7 mm) from ...
Los Angeles Mechanical Code > 5 Exhaust Systems > 506.0 Product-Conveying Ducts > 506.10 Duct Clearances > 506.10.3 Reduced Clearance Permitted
506.11.6.2 Exhaust Systems, Single Flat Wall
If the means for protection is mounted on a single flat wall away from corners, air circulation shall be permitted to be provided by one ...
Los Angeles Mechanical Code > 5 Exhaust Systems > 506.0 Product-Conveying Ducts > 506.11 Clearance Reduction Methods > 506.11.6 Reduce Clearance With Air Gaps > 506.11.6.2 Single Flat Wall
506.11.6.3 Exhaust Systems, Thermal Shielding
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 ...
Los Angeles Mechanical Code > 5 Exhaust Systems > 506.0 Product-Conveying Ducts > 506.11 Clearance Reduction Methods > 506.11.6 Reduce Clearance With Air Gaps > 506.11.6.3 Thermal Shielding
507.3.2.3 Exhaust Systems, Zero Clearance
Quarry tile. Other noncombustible materials or assembly of noncombustible materials that are listed for the purpose of reducing clearance ...
Los Angeles Mechanical Code > 5 Exhaust Systems > 507.0 General Requirements > 507.3 Clearance > 507.3.2 Clearance Reduction > 507.3.2.3 Zero Clearance
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