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506.10.4 Clearance Increases
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All duct systems and system components operating at temperatures above 140°F (60°C) shall have clearances from stored combustible materials or combustible construction not less than those listed in Table 506.10.4. [NFPA 91:4.7.3]
|DUCT GAS TEMPERATURE||LARGEST DUCT DIMENSION (inches)||CLEARANCE (inches)|
|140°F — 600°F incl.||8||8|
|>600°F — 900°F incl.||8||18|
|>900°F||All ducts lined with refractory||24|
For SI units: 1 inch = 25.4 mm, °C=(°F—32)/1.8
Ducts handling materials at temperatures in excess of 900°F (482°C) shall be lined with refractory material or the equivalent. [NFPA 91:184.108.40.206]
When stored combustible materials or combustible construction are protected from ductwork in accordance with Section 506.11, the clearance established in Table 506.10.4 shall be permitted to be reduced in accordance with Table 506.11, but not to less than specified in Section 506.10. [NFPA 91:220.127.116.11]
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