AMERICA’s Sheet Metal Source

Since 1981

Duct Connectors

Duct connectors are an essential part of the system. Transverse connections are the primary location for sealing the duct system from leakage, so the choice of duct connection method has a large impact on the quality of an installation, as well as the cost of installing the system.

At Spiral Pipe of Texas, we offer a wide variety of duct connection products — from traditional methods and 3rd-party products, as well as a few proprietary products we have developed ourselves. We don’t just make “ducts”, we make “duct systems”, and connectors are an essential part.

Single-Wall SPOT Flanges

SPOT Flanges are an economical option for joining spiral round and flat oval pipe and fittings where the size or an installer preference requires a flanged connection. They are roll-formed from 18-gauge galvanized material, then factory mounted on our spiral pipe and fittings by spot-welding and sealing. Field connections are made using neoprene gaskets or butyl tape placed between flanges, then screwed together on 6-inch centers.

Optional materials are available. Please contact the nearest Spiral Pipe of Texas representative for more information.



Double-Wall SPOT Flanges

SPOT Flanges are an economical option for joining double-wall round and flat oval spiral pipe and fittings where the size or an installer preference requires a flanged connection. They are roll-formed from 18-gauge galvanized material, then factory mounted on our spiral pipe and fittings by spot-welding and sealing. A secondary metal nosing is inserted into the inner shell, bridging the gap between the inner and outer shell while isolating the insulation media from the airstream. Field connections are made using neoprene gaskets or butyl tape placed between flanges, then screwed together on 6-inch centers.

Optional materials are available. Please contact the nearest Spiral Pipe of Texas representative for more information.

Gasket-Tite

Sealed Right! Sealed Tite!

Gasket-Tite is our next generation of self-sealing duct systems at Spiral Pipe of Texas. Available in round sizes from 4” to 48” diameter, we give you the ability to easily assemble duct systems that exceed ASHRAE and energy code leakage standards — but without the need for mastic sealants.

Why Should You Use Gasket-Tite from Spiral Pipe of Texas?

Before and After Gasket-Tite Diagram - Spiral Pipe of Texas

Consistent Performance

All duct systems are required to be sealed. All SMACNA seal classes — A, B and C — require the transverse joints where two duct sections join to be sealed. ASHRAE Standard 90.1 requires you to use Seal Class A for all duct systems and tells you how much you are allowed to leak. De-pending on where your job is and what version of the standard is in your building code, that can be anywhere from Leakage Class 6 (2010) to Leakage Class 4 (2019)‡. Most industry references agree that a properly sealed spiral duct system will meet or exceed Leakage Class 3. But how will you know how much your duct system leaks until you test it? The Gasket-Tite system gives you confidence in the performance of your duct joints. We have consistency in manufacturing and we adhere to SPIDA tolerance standards. But most important, we’ve tested the system. Testing in accordance with AMCA 511-13 “Transverse Duct Connections / Air Leakage Rating Requirements” we can give you the expected leakage of each Gasket-Tite duct joint.

Labor-Saving Installation

When using mastics, rolled sealants and tapes, sealing a duct system is an extra and inconsistent step in the process. Not with Gasket-Tite. The joint sealing is accomplished as an integral part of slip-fit installation. No sloppy mess. No gaps in sealant coverage. And no curing time. The duct system can be leak tested immediately. The 180-degree hemmed edge that holds the gasket in place makes connection even easier. No sharp edges and consistent diameter.

Better Appearance

Streaks on exposed metal duct systems- Spiral Pipe of Texas Streaks on exposed white plastic pipe duct systems- Spiral Pipe of Texas

Exposed duct systems have to be sealed too. And no one wants the sight of field-applied mastic covering each duct joint. With Gasket-Tite, the sealant is integral to the joint — and on the inside. Do you ever see those ugly dust streaks at the joints of exposed duct systems? That’s the sign of an unsealed or poorly sealed duct joint. The Gasket-Tite system gives you a full and consistent seal at all 360 de-grees of the joint circumference.

‡ Leakage Class is the CFM leakage volume per 100 ft2 of duct surface area at 1” WG pressure.

When Installing

Assembly of Gasket-Tite Diagram - Spiral Pipe of Texas
  1. Place the hemmed end of the fittings in the spiral pipe, then apply pressure and the fitting will slip into place, stopping at the bead/pipe stop.
  2. Placement of the fastening screws should be opposite from one another, evenly spaced around the circumference (see diagram). Screws should be placed approximately ½” from the bead in order to avoid damaging the spiral seal gasket. In the event of incorrect installation, holes caused by the screw must be sealed before reassembly.
  3. Quantities and sizes to be used are listed below.
    Gasket-Tite Qauntities Diagram - Spiral Pipe of Texas
    Spiral Duct Diameter Screw Diameter Quantity
    3”-5” 1/8” 2
    6”-10” 1/8” 3
    12”-24” 1/8” 4
    26”-36” 1/8” 6
  4. Always start the first fastener at the largest radial gap between fitting and duct. Be sure to achieve even distribution around the circumference.

The Gasket-Tite system is available in single-wall, double-wall, Spiracoustic and our new PhenoliDuct round duct systems.

Product Specifications
Available sizes: 4″ – 48″
Gasket Material: EPDM rubber
Base Gasket: ASTM D2000-86 M3BA 810 B13 C12 F17
Sealing Gasket: ASTM D2000-86 M8BA 507 B13 C12
Operating Temperature: -20⁰ F to 212⁰ F
Flame Spread and Smoke: 0 / 0
ASTM E-84-91A
Materials: Galvanized (standard)
Also: PaintGrip, Aluminum, Stainless Steel (304 & 316)

Angle Ring Specifications

Order Size Inside Diameter I.D. Outside Diameter O.D. Width W Height    H Thickness T Bolt Holes Centers B.C. Hole Size Number of Holes Approx Weight Lbs.
3" 3 1/16" 5 1/16" 1" 7/8" 10 GA 4 5/16" 9/32" 6 0.70
4" 4 1/16" 6 1/16" 1" 15/16" 10 GA 5 5/16" 9/32" 6 0.85
5" 5 1/16" 7 1/16" 1" 1" 10 GA 6 5/16" 9/32" 6 1.18
6" 6 3/32" 8 1/8" 1" 1" 10 GA 7 5/16" 9/32" 6 1.38
7" 7 1/8" 9 1/8" 1" 1" 1/8" 8 7/16" 3/8" 6 1.73
8" 8 1/8" 10 5/8" 1" 1" 1/8" 9 7/16" 3/8" 6 1.90
9" 9  1/8" 11 5/8" 1 1/4" 1 1/4" 1/8" 10 5/8" 7/16" 6 2.55
10" 10 1/8" 12 9/16" 1 1/4" 1 1/4" 1/8" 11 13/16" 7/16" 6 3.05
11" 11 1/8" 13 9/16" 1 1/4" 1 1/4" 1/8" 12 3/4" 7/16" 6 3.25
12" 12 1/8" 15 1/16" 1 1/2" 1 1/2" 1/8" 14" 7/16" 8 3.88
13" 13 1/8" 16 1/16" 1 1/2" 1 1/2" 1/8" 15" 7/16" 8 4.25
14" 14 1/8" 17 1/16" 1 1/2" 1 1/2" 1/8" 16” 7/16" 8 4.75
15" 15 1/8" 18 1/16" 1 1/2" 1 1/2" 3/16" 17" 7/16" 8 7.25
16" 16 1/8" 19 3/16" 1 1/2" 1 1/2" 3/16" 18" 7/16" 8 8.00
17" 17 1/8" 20 3/16" 1 1/2" 1 1/2" 3/16" 19" 7/16" 8 8.25
18" 18 1/8" 22 3/16" 1 1/2" 1 1/2" 3/16" 20" 7/16" 8 8.50
19" 19 1/8" 22 3/16" 1 1/2" 1 1/2" 3/16" 20 3/4" 7/16" 12 8.75
20" 20 1/8" 23 3/16" 1 1/2" 1 1/2" 3/16" 21 3/4" 7/16" 12 9.50
21" 21 1/8" 24 3/16" 1 1/2" 1 1/2" 3/16" 22 3/4" 7/16" 12 10.25
22" 22 1/8" 25 3/16" 1 1/2" 1 1/2" 3/16" 23 3/4" 7/16" 12 10.75
23" 23 1/8" 26 3/16" 1 1/2" 1 1/2" 3/16" 24 7/8" 7/16" 12 11.25
24" 24 1/8" 27 3/16" 1 1/2" 1 1/2" 3/16" 25 7/8" 7/16" 12 11.50
25" 25 1/8" 28 3/16" 1 1/2" 1 1/2" 3/16" 26 7/8" 7/16" 16 12.00
26" 26 1/8" 30 1/8" 2" 2" 3/16" 23 3/8" 7/16" 16 16.75
27" 27 1/8" 31 1/8" 2" 2" 3/16" 29 3/8" 7/16" 16 17.38
28" 28 1/8" 32 1/8" 2" 2" 3/16" 30 3/8" 7/16" 16 18.00
29" 29 1/8" 33 1/8" 2" 2" 3/16" 31 3/8" 7/16" 16 18.75
30" 30 1/8" 34 1/8" 2" 2" 3/16" 32 3/8" 7/16" 16 19.50
31" 31 1/8" 35 1/8" 2" 2" 3/16" 33 3/8" 7/16" 16 20.38
32" 32 1/8" 36 1/8" 2" 2" 3/16" 34 3/8" 7/16" 16 20.75
33" 33 1/8" 37 1/8" 2" 2" 3/16" 35 3/8" 7/16" 16 21.25
34" 34 1/8" 38 1/8" 2" 2" 3/16" 36 3/8" 7/16" 16 22.00
35" 35 1/8" 39 1/8" 2" 2" 3/16" 37 3/8" 7/16" 16 22.50
36" 36 1/8" 40 1/8" 2" 2" 3/16" 38 3/8" 7/16" 16 23.00
37" 37 1/8" 41 1/8" 2" 2" 3/16" 39 3/8" 7/16" 24 23.75
38" 38 1/8" 42 1/8" 2" 2" 3/16" 40 3/8" 7/16" 24 24.50
39" 39 1/8" 43 1/8" 2" 2" 3/16" 41 3/8" 7/16" 24 25.00
40" 40 1/8" 44 1/8" 2" 2" 3/16" 42 3/8" 7/16" 24 25.75
41" 41 1/8" 45 1/8" 2" 2" 3/16" 43 3/8" 7/16" 24 26.13
42" 42 1/8" 46 1/8" 2" 2" 3/16" 44 3/8" 7/16" 24 26.50
43" 43 1/8" 47 1/8" 2" 2" 3/16" 45 3/8" 7/16" 24 27.38
44" 44 1/8" 48 1/8" 2" 2" 3/16" 45 3/8" 7/16" 24 28.00
45" 45 1/8" 49 1/8" 2" 2" 3/16" 47 3/8" 7/16" 24 28.63
46" 46 1/8" 50 1/8" 2" 2" 3/16" 48 3/8" 7/16" 24 29.00
47" 47 1/8" 51 1/8" 2" 2" 3/16" 49 3/8" 7/16" 24 29.88
48" 48 1/8" 52 1/8" 2" 2" 3/16" 50 3/8" 7/16" 24 30.75
49" 49 1/8" 53 1/8" 2" 2" 3/16" 51 3/8" 7/16" 24 31.50
50" 50 1/8" 54 1/8" 2" 2" 3/16" 52 3/8" 7/16" 24 32.00
51" 51 1/8" 55 1/8" 2" 2" 3/16" 53 3/8" 7/16" 24 32.75
52" 52 1/8" 56 1/8" 2" 2" 3/16" 54 3/8" 7/16" 24 33.38
53" 53 1/8" 57 1/8" 2" 2" 3/16" 55 3/8" 7/16" 24 34.00
54" 54 1/8" 58 1/8" 2" 2" 3/16" 56 3/8" 7/16" 24 34.75
55" 55 1/8" 59 1/8" 2" 2" 3/16" 57 3/8" 7/16" 32 35.38
56" 56 1/8" 60 1/8" 2" 2" 3/16" 58 3/8" 7/16" 32 36.00
57" 57 1/8" 61 1/8" 2" 2" 3/16" 59 3/8" 7/16" 32 36.50
58" 58 1/8" 62 1/8" 2" 2" 3/16" 60 3/8" 7/16" 32 37.00
59" 59 1/8" 63 1/8" 2" 2" 3/16" 61 3/8" 7/16" 32 37.75
60" 60 1/8" 64 1/8" 2" 2" 3/16" 62 3/8" 7/16" 32 38.50
61" 61 1/8" 65 1/8" 2" 2" 3/16" 63 3/8" 7/16" 32 39.00
62" 62 1/8" 66 1/8" 2" 2" 3/16" 64 3/8" 7/16" 32 39.75
63" 63 1/8" 67 1/8" 2" 2" 3/16" 65 3/8" 7/16" 32 40.38
64" 64 1/8" 68 1/8" 2" 2" 3/16" 66 3/8" 7/16" 32 41.00
65" 65 1/8" 69 1/8" 2" 2" 3/16" 67 3/8" 7/16" 32 41.75
66" 66 1/8" 70 1/8" 2" 2" 3/16" 68 3/8" 7/16" 32 42.38
67" 67 1/8" 71 1/8" 2" 2" 3/16" 69 3/8" 7/16" 32 43.00
68" 68 1/8" 72 1/8" 2" 2" 3/16" 70 3/8" 7/16" 32 43.50
69" 69 1/8" 73 1/8" 2" 2" 3/16" 71 3/8" 7/16" 32 44.25
70" 70 1/8" 74 1/8" 2" 2" 3/16" 72 3/8" 7/16" 32 44.88
71" 71 1/8" 75 1/8" 2" 2" 3/16" 73 3/8" 7/16" 32 45.50
72" 72 1/8" 76 1/8" 2" 2" 3/16" 74 3/8" 7/16" 32 46.25

*** Angle rings listed above are standard stock construction. Heavier construction and higher hole counts may be required for many applications, including industrial systems, negative pressure and high positive pressures.

Angle Ring Attachment


Available Materials

Carbon Steel (Black Iron) — standard
Hot Dipped Galvanized (ASTM A123)
Zinc Electroplated (ASTM B633)
Stainless Steel — 304 & 316
Aluminum

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Spiral Pipe of Texas

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