Fittings fabricated from GF Harvel CPVC Duct are readily available in most configurations. To maintain system integrity, consistency, and compatibility, all duct fittings, fume hoods, fume scrubbers, fans, blast gates and other system components should be fabricated from CPVC sheet or duct material of the same wall thickness. Additional information concerning CPVC Duct fittings and other system components can be obtained by contacting: GF Harvel Inc. at (610) 252-7355.