2404.3.2.1 Materials.
FC § 2404.3.2.1
Spray booths shall be constructed of approved noncombustible materials. Aluminum shall not be used. Where walls or ceiling assemblies are constructed of sheet metal, single-skin assemblies shall be no thinner than 0.0478 inch (18 gauge) (1.2 mm) and each sheet of double-skin assemblies shall be no thinner than 0.0359 inch (20 gauge) (0.9 mm). Structural sections of spray booths may be sealed with latex-based or similar caulks and sealants. The interior surfaces of spray booths shall be smooth and shall be constructed so as to permit the free passage of exhaust air from all parts of the interior and to facilitate washing and cleaning, and shall be designed to confine residues within the booth.
