Atco’s new ULTRA-FLEX should be used to replace new or existing flexible ductwork that will be directly exposed to damaging ultraviolet radiation from UV bio-treatment lamps. Each kit includes a 10-foot piece of UL 181 listed ULTRA-FLEX duct and a 4-inch-long metal connecting sleeve. Diameters of 4 to 20 inches are available.

Atco Rubber Products, 800-877-3828,