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» High Pressure Galvanized » Low Pressure Galvanized » PVS Underground HVAC/Chemical Duct
Low/High Pressure Defined
Product Selection Diagram
Concentric/Eccentric Reducers
Starting Collars
End Caps
45° Boot Saddles
45° Laterals
90° Boot Saddles
90° Tee's
90° Shoe Taps
High Efficiency Takeoff
Air Intake Hood
Roof Jack
Spiral Pipe
Pant Wye's
Quadrant Dampers
90° Register Saddles
Ufo Head
Warm Air Head
Ceiling Head
Rectangular Duct
Volume Damper
Plenum with Cap
Filter Rack
Access Panels
Installation Accessories
Slips, Flat Drive, Furnace Access.
Rec. Sheet Metal Gauges & Const.
Longitudinal Seams
Duct Reinforcement

Product Selection Schematic
Click on image.


Largest Duct Dimension
(width or height)

plain s slip
"S" Slip (B)

drive slip cleat
Drive Slip or
Cleat (A)

hemmed s slip
"S" Slip (C)

standing s slip
"S" Slip (D)
ductmate 35 tdc
Ductmate 35
or TDC (E)
companion angles
Companion Angles (F)
reinforceing between joints
Reinforcing Between Joints
Steel Aluminum
Thru 12" 26 24(.020) A-B ----- ----- ----- -----
13" - 18" 24 22(.025) A-B ----- ----- ----- -----
19" - 30" 24 22(.025) ----- C-D @ 5' cc
D @ 10 cc
----- ----- 1"x1"x1/8" @ 5' cc
31" - 42" 22 20(.032) ----- ----- E @ 5' cc ----- 1-1/2"x1-1/2"x1/8" @ 5' cc
43" - 54" 22 20(.032) ----- ----- -----

F @ 5' cc
F @ 10' cc

2"x2"x1/8" @ 5' cc
Pittsburgh Lock Seam Button-Punch Snap Lock Seam
pittsburgh lock seam button punch snap lock seam
Spiral Manufacturing Co., Inc. single-wall, rectangular duct fittings are factory fabricated to furnish you with a high-quality line of products in a broad range of standard sizes. To minimize field assembly costs, rectangular duct is supplied in lengths up to ten feet. Longitudinal seams are typically manufactured with Pittsburgh Lockseam or Button-Punch Snap Lock. In addition, all applied duct connectors are available in economical Ductmate 35 traverse duct connectors, Slip & Drive slip joints, and four-bolt connectors. Rectangular ductwork is typically crossbroke (to increase rigidity) and can be shipped completely assembled or knocked down. Spiral Manufacturing Co., Inc. standard rectangular products are fabricated to meet or exceed SMACNA duct construction standards. In addition to standard, we can custom fabricate rectangular ductwork for commercial and industrial applications according to your specifications.
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Drive Slip or Cleat (A)
drive slip cleat
Drive Slip - Ends of ducts inserted under cleat. For narrow sides of ducts that are 18" or less. Drive slips that are 19" thru 30" must be reinforced with 1" x 1" x 1/8" angle.
Hemmed "S" Slip (C)
hemmed s slip
Hemmed "S" Slip - Ends of ducts inserted into open ends of "S". Use wide wide sides of small ducts. Edges hemmed to produce stiffness.
Standing "S" Slip (D)
standing s slip
Standing "S" Slip - Similar to "S" Slip except fpr standing edge which is formed to provide reinforcing. The standing leg is folded to two thicknesses for stiffness.
Ductmate 35 - Traverse Duct Connector (E)
ductmate 35 traverse duct connector
Ductmate 35 - Traverse duct connection systems consist of installed roll-formed flanges. Corner pieces, gaskets, and cleat complete the joint assembly. The flanges attach to duct end and have integral mastic which allows the flange to seal itself to the duct. Corner pieces add rigidity to the flange, hold the ductwork together and provide a sealing surface for the gasket. The gasket serves as a seal between the flanges. The cleat insures even compression of the gasket along the length of the flange.
Companion Angles (F)
companion angles
Companion Flange or Angles - Angle frames are riveted, bolted or welded to duct ends and are then bolted together with gaskets or caulking to prevent air leakage. Recommended for use where duct sections must be removed periodically. Angle iron flanges are standard mild steel. Galvanized are available along with punched holes. Bolt Hole Centers (BHC) need to be specified along with angle iron size.
11419 Yellowpine St. NW - Minneapolis, MN 55448 - Ph: 763-755-7677 - 1-800-426-3643 - info@spiralmfg.com