The chemical inertness of PVC, combined with the strength of Spiral pipe, make Vinyl coated duct ideal for chemical fume removal applications and for underground HVAC applications where strength and resistance to corrosive salts and other minerals found in backfill are prerequisites.
Our vinyl-coated Spiral pipe is UL listed and manufactured from galvanized steel, coated with a polyvinyl chloride material with an outside thickness of 4 mils and inside thickness of 1 mil standard. This is reversible for special purposes. External corrugations are standard for over 14″ diameter for underground applications. Standard gauges are: 4″ to 16″ / 24 gauge, 17″ to 24″ / 22 gauge, 26″ to 48″ / 20 gauge.