These corrosion-proof 8" CPVC Blast Dampers are for the construction of exhaust ventilation systems. CPVC material compounds used in the manufacture of these duct fittings conform to Type VI, Grade 1 CPVC, Cell Class 23447 as described in ASTM D-1784. Dampers are furnished with a three position locking pin (open, half open, and closed). Dimensions 8.5" long, 10.25" wide, and 14" high (not including gate). Gate is 3/16" thick and socket depth is 2.25". Maximum service temperature is 200°F. NOTES: Fittings are triple bead welded. Pictures are to represent style of fittings only; actual color is light gray.