Spiral Vinyl-Coated Pipe

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.

Spiral Insulated Pipe

Our dual-wall spiral insulated duct adds both thermal insulating and sound attenuating benefits to any air distribution system. This dual-wall product consists of inner and outer spiral pipes with a layer of glass fiber insulation sandwiched in between, thus reducing noise and conserving energy.

Material Handling and Truck Loading

The ability of spiral pipe to handle high pressures, its efficient airflow characteristics, and its low pressure loss make Spiral pipe ideal for bulk material handling applications. We offer a complete line of trailer loading accessories, including ball joints, diverter valves, quick disconnects, and air actuated gates. See pages 45-49 for components and technical data.


Spiral Manufacturing offers a complete line of seam welded, slip-joint fittings designed especially for use with Spiral pipe. Standard fittings include many types of elbows, crosses, tees, laterals, reducers, and other components fabricated from standard 20 gauge steel (other gauges available).