1.1 This specification covers ducts and hoods fabricated by contact molding intended for use in handling corrosive fumes and process gases. Special attention is given to equipment that operates at temperatures over 180°F (82.2°C) with regard to strength and corrosion resistance.

1.2 The material of construction shall be "fiberglass" consisting of a polyester, vinyl ester, or other qualified resin-matrix systems with fiber reinforcement in accordance with Specification C582.

1.3 This specification is not intended to cover selection of resins and reinforcements for specific chemical environments.

1.4 All descriptions and limitations in this specification are to include both ducts and hoods, where applicable.

1.5 This specification covers ducts and hoods up to a design pressure of +5 psig (34.5 Pa).

1.6 The values stated in inch-pound units are to be regarded as the standard. The SI units given in parentheses are for information only.