- Round duct and fittings shown
or specified as PVC coated steel to be constructed of U.L.
listed, 4x1 PolyVinyl Coated galvanized steel
approved by I.C.B.O. for direct ground burial.
- Ductwork to be gauged per I.C.B.O. standards.
- Spiral duct larger than
8" diameter to have a corrugation profile.
- Fittings fabricated with
stainless steel rivets and sealed with U.L.
- Spiral duct to bear U.L. marking per 10-ft section.
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