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Single-Wall HVAC Spiral Pipe & Fittings

SMC Single-Wall Spiral Pipe and Duct Fittings with Complete Seal, E-Z Flange and Barrel Clamp or Standard Slip Connection

Single-Wall Spiral Pipe

Single-wall spiral pipe duct has a resistance to crushing approximately 2 1/2 times that of longitudinal lockseam or welded pipe. Optional corrugations are available which increase the rigidity of the pipe by approximately 300%. Pipe sections can be joined together by a Complete Seal Spiral Pipe Connector, E-Z Flange with Barrel Clamp, E-Z Flange Jr. with Barrel Clamp, Standard Spiral Pipe Connector, or Companion Angle Rings.

Single-Wall Materials

*PVS specification book available
**Call factory for sizes over 60" in diameter

Single-Wall Fittings

SMC spiral fittings are manufactured with a stitch weld seam, lap seam (riveted, tack weld or solid weld), elbow lock seam, standing seam or butt weld seam. These may be with or without duct sealant.

All spiral duct fittings can be manufactured with:

• Complete Seal Spiral Pipe System – 3” to 24” Diameter
• E-Z Flange Jr. with Barrel Clamp – 6” to 24” Diameter
• E-Z Flange with Barrel Clamp – 26” to 96” Diameter
• Standard Spiral Pipe End
• Companion Angle Ring

Single-Wall Connectors

Complete Seal Fittings - 6” to 24” Diameter

Complete Seal fittings are manufactured from galvanized steel meeting spec ASTM A-653 (Lockforming quality). They feature a double legged EPDM gasket which creates a virtually airtight connection when slipped into spiral pipe. The gasket is mechanically attached to the fitting with a 180 degree hemmed edge. This hem gives added rigidity to the fittings, ensures that the gasket will never slip out of place and makes a safe rounded edge for the installer.
*Complete Seal is currently available on Galvanized Fittings only.

E-Z Flange with Barrel Clamp - 26” to 96” Diameter

The E-Z flange with barrel clamp can be factory installed or shipped loose for field installation. A set consists of two E-Z flanges and one barrel clamp. For field installation, the installer attaches the E-Z flange to the pipe and fittings. Next the installer applies the gasket to one flange, mates the two flanges together and attaches the barrel clamp. SMC can also install E-Z flanges. Factory-installed flanges are spot welded and internally sealed on all ends of the spiral pipe and fittings.

E-Z Flange Jr. with Barrel Clamp - 6” to 24” Diameter

The E-Z Flange Jr. is a 5/8” flange turned out 90° on each end of the spiral duct and fittings. The installer applies a gasket on one flange, mates the two flanges together, and attaches the barrel clamp. For field cuts a 5/8” flanged sleeve is available. Trim the spiral pipe to the measured length and attach the sleeve.

Standard Spiral Pipe Connector

Pipe-to-Pipe connections are made by using a fitting size coupling that slips inside the mating pipe sections. A stop bead runs around the middle of the coupling to center the coupling in the connection. Secure the connection by installing sheet metal screws through the outer shell of the duct, 1/2 inch from the stop bead.

Companion Angle Rings - Pressed and Rolled

Companion angle rings are for end connections whenever a smooth interior surface or intermediate stiffening is required. Rings are manufactured from mild steel. Companion angle rings can be factory installed or shipped loose. Companion angle rings can be attached by solid weld, tack weld, or van stone connection.

Two Piece Pressed Solid Welded Elbows

Pressed elbows and angles are resistance welded with copper on both the heel and throat. All pressed fittings are manufactured from extra deep drawing steel (EDDS) in accordance with ASTM-A653. Pressed fittings are precision drawn, tolerances must be within + or - .002 thickness to assure a quality product at all times. All pressed fittings are made of 24 Ga. or 22 Ga. Galvanized material with a G60 or better coating thickness and are chemically treated to retard white rust.

Standing Seam Elbows and Angles

Standing Seam fittings work well for medium pressure applications and offer an alternative to welded elbows and angles. These are available from 8” through 60” diameters and fabricated as heavy as 16 gauge. Other diameters and throat radiuses are available.
* 42” and larger diameter 90-degree elbows are fabricated using two 45 degree angles connected with an E-Z Flange and Barrel Clamp unless otherwise specified.

Full Sweep Standing Seam Elbows

8”-30” will be a 5 gore one-piece standard throat construction. 32” and larger in diameter 90-degree full sweep (1.5 x CL) elbows are fabricated using two 45 degree angles connected with an E-Z flange and barrel clamp unless otherwise specified.

Adjustable Elbows & Angles

Welded Gored Elbows and Angles

Standard Elbows and Angles are fabricated from 20 gauge galvanized material. Other diameters, throat radiuses and gauges are available; please consult the factory for additional information.


52” and larger in diameter 90-degree full sweep (1.5 x CL) elbows are fabricated using two 45 degree angles connected with an E-Z flange and barrel clamp unless otherwise specified.

90-Degree Tee

Dimensions to be listed as follows: A, B, C
L = “C” + 4
All fittings are 1.75" from bead to end of fitting.

Tee With Reducer

Dimensions to be listed as follows: A, B, C
L = “C” + 4”
L.R. Refer to page 9
All fittings are 1.75" from bead to end of fitting.

Cross

Dimensions to be listed as follows: A, B, C, D
L = Largest of "C" or "D" + 4"
All fittings are 1.75" from bead to end of fitting.

Cross With Reducer

Dimensions to be listed as follows: A, B, C, D
L = Largest of "C" or "D" + 4"
L.R. Refer to page 9
All fittings are 1.75" from bead to end of fitting.

Conical Tee

Dimensions to be listed as follows: A, B, C
L = C + 5"
All fittings are 1.75" from bead to end of fitting.

Conical Tee with Reducer

Dimensions to be listed as follows: A, B, C
L = C + 5"
L.R. Refer to page 9
All fittings are 1.75" from bead to end of fitting.

Conical Cross

Dimensions to be listed as following A, B, C, D
L = Larger of "C" or "D" + 5"
All fittings are 1.75" from bead to end of fitting.

Conical Cross With Reducer

Dimensions to be listed as following A, B, C, D
L = Larger of "C" or "D" + 5"
L.R.: Refer to page 9
All fittings are 1.75" from bead to end of fitting.

High-Efficiency Takeoffs

Our High-Efficiency Takeoff is designed with a rectangular opening and an approximate 45° slope on the body. A flange is turned out on all four sides. The flange also has pre-punched holes for easy installation. There is a closed cell neoprene gasket (3/4” X 1/4”) applied to the flange to assure a tight seal.
High-Efficiency Takeoffs are fabricated from both 26 and 24 gauge galvanized steel. These fittings can come with or without volume dampers. The adjustable dampers are assembled using a spring-loaded retractable bearing and positive locking hardware. Test data is available; contact us for more information.