602.2.1.3 Pneumatic tubing.
MC § 602.2.1.3
Combustible pneumatic tubing exposed within a plenum shall have a peak optical density of 0.50 or less, an average optical density of 0.15 or less, and a flame spread of 5 feet (1524 mm) or less when tested in accordance with UL 1820. Combustible pneumatic tubing shall be listed and labeled.











