Low & Medium Pressure Acoustically Lined Spiral Duct & Fittings – CLM-0789

CLM-0789 duct combines galvanized ductwork with a 1” thick preformed fiberglass duct liner. Spiral pipe gauges will meet or exceed current SMACNA HVAC Duct Construction Standards, unless otherwise specified.

A wide variety of fittings are produced by ADMP for Low and Medium Pressure acoustically lined systems including 90, 60, 45, and 30 degree elbows as standards, tees, laterals, reducing laterals, reducers, couplings, end caps, crosses, etc. For elbows, a centerline radius of one times the diameter is standard. 1-1/2 times the diameter to centerline (full radius) is standard.

Gores & Seams:

Lapping of seams are in the direction of air flow. The gore & seams are spot welded sand internally sealed using high pressure duct sealant.

Fittings shall be spot welded and internally sealed with duct sealant.






Entrance Edges:

Particular attention is given to the entrance for conical tees, straight tees, and laterals. These fittings have a special rounded entrance edge. They are not butt welded square entrance contractor type fittings.

All fittings are lined with 1” thick preformed fiberglass duct liner.

Fittings are machine cut on our State-of-the-Art Vulcan Plasma table, assuring manufacturing tolerance consistency.

Specialty Fittings:

Specialty configurations are available upon request. Some examples are as follows: Elbows (75, 15 and other degree angles are also available), a wide variety of different radii are available. Flange connections are available by the following, but not limited to: Angle Rings or, AccuDuct, Spiral Mate.

Construction Standards:

As listed in the current SMACNA HVAC Duct Construction Standards. Other regulatory construction standards are available upon request.



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