About Duct Connections
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Crush-Resistant Spiral Duct and Fittings
![](/prerenderstable/mvPRE/contents/gfx/imagecache/h01/h01a-spiral-duct-connection-gil1548180353@halfx_635503701760000000.png?ver=imagenotfound)
A spiral seam makes this duct strong and rigid. Fittings have male ends with a slightly smaller diameter to press-fit into duct.
Galvanized steel has good corrosion resistance. PVC-coated steel combines the strength of steel with the corrosion resistance of plastic. 304 stainless steel is more corrosion resistant than steel.
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/507/5078k15p1-@halfx_637000824898262691.png?ver=imagenotfound)
Add a noise reducer to duct to decrease noise by as much as 50%.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/256/2561k16_5a2b712b-44d9-4850-b784-2861d455da9c1719858070@halfx_9ecwd_1719858074.png?ver=imagenotfound)
Duct Size | Male OD | Gauge | End Construction | Each | |
Galvanized Steel | |||||
---|---|---|---|---|---|
4 | 3 7/8" | 24 | Spiral | 0000000 | 000000 |
5 | 4 7/8" | 24 | Spiral | 0000000 | 00000 |
6 | 5 7/8" | 24 | Spiral | 0000000 | 00000 |
8 | 7 7/8" | 24 | Spiral | 0000000 | 00000 |
10 | 9 7/8" | 24 | Spiral | 0000000 | 00000 |
12 | 11 7/8" | 24 | Spiral | 0000000 | 000000 |
PVC-Coated Steel | |||||
4 | 3 7/8" | 24 | Plain | 00000000 | 00000 |
5 | 4 7/8" | 24 | Plain | 00000000 | 000000 |
6 | 5 7/8" | 24 | Plain | 00000000 | 000000 |
7 | 6 7/8" | 24 | Plain | 00000000 | 000000 |
8 | 7 7/8" | 24 | Plain | 00000000 | 000000 |
9 | 8 7/8" | 24 | Plain | 00000000 | 000000 |
10 | 9 7/8" | 24 | Plain | 00000000 | 000000 |
12 | 11 7/8" | 24 | Plain | 00000000 | 000000 |
304 Stainless Steel | |||||
4 | 3 7/8" | 20 | Plain | 0000000 | 000000 |
6 | 5 7/8" | 20 | Plain | 0000000 | 000000 |
8 | 7 7/8" | 20 | Plain | 0000000 | 000000 |
10 | 9 7/8" | 20 | Plain | 0000000 | 000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/256/2561k21p1-h01a-digitall@halfx_637147639599826861.png?ver=imagenotfound)
Duct Size | Male OD | Gauge | End Construction | Each | |
Galvanized Steel | |||||
---|---|---|---|---|---|
3 | 2 7/8" | 24 | Spiral | 00000000 | 000000 |
4 | 3 7/8" | 24 | Spiral | 00000000 | 00000 |
5 | 4 7/8" | 24 | Spiral | 00000000 | 00000 |
6 | 5 7/8" | 24 | Spiral | 00000000 | 00000 |
8 | 7 7/8" | 24 | Spiral | 00000000 | 00000 |
10 | 9 7/8" | 24 | Spiral | 00000000 | 00000 |
12 | 11 7/8" | 24 | Spiral | 00000000 | 00000 |
14 | 13 7/8" | 24 | Spiral | 00000000 | 00000 |
16 | 15 7/8" | 24 | Spiral | 00000000 | 000000 |
PVC-Coated Steel | |||||
4 | 3 7/8" | 24 | Plain | 00000000 | 00000 |
5 | 4 7/8" | 24 | Spiral | 00000000 | 00000 |
6 | 5 7/8" | 24 | Plain | 00000000 | 00000 |
7 | 6 7/8" | 24 | Plain | 00000000 | 00000 |
8 | 7 7/8" | 24 | Plain | 00000000 | 00000 |
9 | 8 7/8" | 24 | Plain | 00000000 | 000000 |
10 | 9 7/8" | 24 | Plain | 00000000 | 000000 |
12 | 11 7/8" | 24 | Spiral | 00000000 | 000000 |
304 Stainless Steel | |||||
4 | 3 7/8" | 20 | Plain | 0000000 | 000000 |
6 | 5 7/8" | 20 | Plain | 0000000 | 000000 |
8 | 7 7/8" | 20 | Plain | 0000000 | 000000 |
10 | 9 7/8" | 20 | Plain | 0000000 | 000000 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/507/5078k48p1-h01a-digitall@halfx_637147659664635836.png?ver=imagenotfound)
Male straight connectors are required to connect two pieces of duct.
Galvanized Steel | PVC-Coated Steel | 304 Stainless Steel | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Duct Size | Male OD | End Construction | Gauge | Each | Gauge | Each | Gauge | Each | |||
Male | |||||||||||
4 | 3 7/8" | Plain | 24 | 0000000 | 000000 | 26 | 00000000 | 000000 | 24 | 0000000 | 000000 |
5 | 4 7/8" | Plain | 24 | 0000000 | 00000 | 26 | 00000000 | 00000 | __ | 000000 | 00 |
6 | 5 7/8" | Plain | 24 | 0000000 | 00000 | 26 | 00000000 | 00000 | 24 | 0000000 | 00000 |
7 | 6 7/8" | Plain | __ | 000000 | 00 | 26 | 00000000 | 00000 | __ | 000000 | 00 |
8 | 7 7/8" | Plain | 24 | 0000000 | 00000 | 26 | 00000000 | 00000 | 24 | 0000000 | 00000 |
9 | 8 7/8" | Plain | __ | 000000 | 00 | 26 | 00000000 | 00000 | __ | 000000 | 00 |
10 | 9 7/8" | Plain | 24 | 0000000 | 00000 | 26 | 00000000 | 00000 | 24 | 0000000 | 00000 |
12 | 11 7/8" | Plain | 24 | 0000000 | 00000 | 26 | 00000000 | 00000 | __ | 000000 | 00 |
![](/prerenderstable/mvPRE/contents/gfx/imagecache/507/5078k59p1--388ede2a1fb1564412464-p9@halfx_636999912887595254.png?ver=imagenotfound)
Reducers connect duct with different diameters.
Duct Size | Male OD | ||||||
---|---|---|---|---|---|---|---|
(A) | (B) | (A) | (B) | End Construction | Gauge | Each | |
Galvanized Steel | |||||||
5 | 4 | 4 7/8" | 3 7/8" | Plain | 24 | 0000000 | 000000 |
6 | 4 | 5 7/8" | 3 7/8" | Plain | 24 | 0000000 | 00000 |
6 | 5 | 5 7/8" | 4 7/8" | Plain | 24 | 0000000 | 00000 |
8 | 6 | 7 7/8" | 5 7/8" | Plain | 24 | 0000000 | 00000 |
10 | 8 | 9 7/8" | 7 7/8" | Plain | 24 | 0000000 | 00000 |
12 | 10 | 11 7/8" | 9 7/8" | Plain | 24 | 0000000 | 00000 |
PVC-Coated Steel | |||||||
5 | 4 | 4 7/8" | 3 7/8" | Plain | 20 | 00000000 | 00000 |
6 | 4 | 5 7/8" | 3 7/8" | Plain | 20 | 00000000 | 00000 |
6 | 5 | 5 7/8" | 4 7/8" | Plain | 20 | 00000000 | 00000 |
7 | 6 | 6 7/8" | 5 7/8" | Plain | 20 | 00000000 | 00000 |
8 | 6 | 7 7/8" | 5 7/8" | Plain | 20 | 00000000 | 00000 |
8 | 7 | 7 7/8" | 6 7/8" | Plain | 20 | 00000000 | 00000 |
9 | 8 | 8 7/8" | 7 7/8" | Plain | 20 | 00000000 | 00000 |
10 | 8 | 9 7/8" | 7 7/8" | Plain | 20 | 00000000 | 000000 |
10 | 9 | 9 7/8" | 8 7/8" | Plain | 20 | 00000000 | 000000 |
12 | 10 | 11 7/8" | 9 7/8" | Plain | 20 | 00000000 | 000000 |
304 Stainless Steel | |||||||
6 | 4 | 5 7/8" | 3 7/8" | Plain | 20 | 0000000 | 00000 |
8 | 6 | 7 7/8" | 5 7/8" | Plain | 20 | 0000000 | 000000 |
10 | 8 | 9 7/8" | 7 7/8" | Plain | 20 | 0000000 | 000000 |
Chemical-Resistant Duct and Fittings
![](/prerenderstable/mvPRE/contents/gfx/imagecache/205/2051k889-1634673510-p9@halfx_637702523318112159.png?ver=imagenotfound)
Made of PVC plastic to withstand acids, alkalies, salts, and other corrosive vapors and fumes. Use PVC pipe cement (not included) to secure components. Fittings have female ends with a slightly larger diameter to press-fit over duct.
For technical drawings and 3-D models, click on a part number.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/205/2051k21c1--73672258b2c1564083841-p9@halfx_636996626634781642.png?ver=imagenotfound)
Reducers connect duct with different diameters.
Straight-Run Fabric Duct
Evenly distribute air from fans and blowers throughout large spaces.
Duct is durable, flame-retardant polyethylene plastic with evenly spaced air holes. Use the sewn-in snap hooks to hang it from beams or cable.
![](/prerenderstable/mvPRE/contents/gfx/imagecache/177/1771kp1-h01al1548180330@halfx_635460368200000000.png?ver=imagenotfound)
![](/prerenderstable/mvPRE/contents/gfx/imagecache/177/1771k27p1-@halfx_637038898063913571.png?ver=imagenotfound)
25 ft. Lg. | 50 ft. Lg. | ||||||||
---|---|---|---|---|---|---|---|---|---|
Duct Size | Female ID | Recommended Airflow, cfm | Color | Max. Temp., °F | Connection Type | Each | Each | ||
12 | 12 1/2" | 1,000-1,500 | White | 180° | Worm-Drive Clamp | 0000000 | 0000000 | 0000000 | 0000000 |
15 | 15 1/2" | 1,500-2,500 | White | 180° | Worm-Drive Clamp | 0000000 | 000000 | 0000000 | 000000 |
18 | 18 1/2" | 2,500-3,500 | White | 180° | Worm-Drive Clamp | 0000000 | 000000 | 0000000 | 000000 |
24 | 24 1/2" | 3,500-5,000 | White | 180° | Worm-Drive Clamp | 0000000 | 000000 | 0000000 | 000000 |
30 | 30 1/2" | 6,500-8,000 | White | 180° | Worm-Drive Clamp | 0000000 | 000000 | 0000000 | 000000 |