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SEC. 57.2404.7.9.1. GAUGE OF METAL.
 
   Every duct or pipe shall be constructed of galvanized metal sheets in accordance with the provisions of Table 57.2404.7.9.1.
 
TABLE 57.2404.7.9.1
SPRAY EXHAUST DUCTS – GAUGE OF METAL
 
 
Duct Cross-Sectional Dimension in Inches
Gauge of Duct Metal
Up to 8
24
Over 8 inches to 18
22
Over 18 inches to 30
20
Over 30
18