About Duct Connections
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Standard Duct and Fittings

No need for clamps or connectors—duct and fittings press-fit together. Male ends are crimped or tapered, making them slightly smaller than a female end for simple assembly.
304 stainless steel is more corrosion resistant than steel and aluminum.
For technical drawings and 3-D models, click on a part number.

Connectors with welded seams prevent leaks.
304 Stainless Steel | |||||||
---|---|---|---|---|---|---|---|
Duct Size | Female ID | Male OD | Features | End Construction | Gauge | Each | |
3 | 3" | 2 7/8" | Welded Seams | Tapered | 20 | 00000000 | 0000000 |
4 | 4" | 3 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
5 | 5" | 4 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
6 | 6" | 5 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
7 | 7" | 6 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
8 | 8" | 7 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
10 | 10" | 9 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
12 | 12" | 11 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
14 | 14" | 13 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
16 | 16" | 15 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
18 | 18" | 17 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
20 | 20" | 19 7/8" | Welded Seams | Tapered | 20 | 00000000 | 00000000 |

Connectors with welded seams prevent leaks.
304 Stainless Steel | |||||||
---|---|---|---|---|---|---|---|
Duct Size | Female ID | Male OD | Features | End Construction | Gauge | Each | |
3 | 3" | 2 7/8" | Welded Seams | Tapered | 20 | 00000000 | 0000000 |
4 | 4" | 3 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
5 | 5" | 4 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
6 | 6" | 5 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
7 | 7" | 6 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
8 | 8" | 7 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
10 | 10" | 9 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
12 | 12" | 11 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
14 | 14" | 13 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
16 | 16" | 15 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
18 | 18" | 17 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
20 | 20" | 19 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |

Adjustable-angle elbow connectors can be used at an angle or straight.
304 Stainless Steel | ||||||
---|---|---|---|---|---|---|
Duct Size | Female ID | Male OD | Gauge | End Construction | Each | |
3 | 3" | 2 7/8" | 26 | Crimped | 0000000 | 000000 |
4 | 4" | 3 7/8" | 26 | Crimped | 0000000 | 00000 |
5 | 5" | 4 7/8" | 26 | Crimped | 0000000 | 00000 |
6 | 6" | 5 7/8" | 26 | Crimped | 0000000 | 00000 |
7 | 7" | 6 7/8" | 26 | Crimped | 0000000 | 00000 |
8 | 8" | 7 7/8" | 26 | Crimped | 0000000 | 000000 |
10 | 10" | 9 7/8" | 26 | Crimped | 0000000 | 000000 |
12 | 12" | 11 7/8" | 26 | Crimped | 0000000 | 000000 |
Crush-Resistant Spiral Duct and Fittings

A spiral seam makes this duct strong and rigid. Fittings have male ends with a slightly smaller diameter to press-fit into duct.
304 stainless steel is more corrosion resistant than steel.
For technical drawings and 3-D models, click on a part number.

304 Stainless Steel | |||||
---|---|---|---|---|---|
Duct Size | Male OD | Gauge | End Construction | Each | |
3 | 2 7/8" | 20 | Spiral | 00000000 | 0000000 |
4 | 3 7/8" | 20 | Plain | 0000000 | 000000 |
5 | 4 7/8" | 20 | Spiral | 00000000 | 000000 |
6 | 5 7/8" | 20 | Plain | 0000000 | 000000 |
7 | 6 7/8" | 20 | Spiral | 00000000 | 000000 |
8 | 7 7/8" | 20 | Plain | 0000000 | 000000 |
9 | 8 7/8" | 24 | Spiral | 00000000 | 000000 |
10 | 9 7/8" | 20 | Plain | 0000000 | 000000 |
12 | 11 7/8" | 24 | Spiral | 00000000 | 000000 |
14 | 13 7/8" | 24 | Spiral | 00000000 | 000000 |
16 | 15 7/8" | 24 | Spiral | 00000000 | 000000 |
18 | 17 7/8" | 24 | Spiral | 00000000 | 000000 |

304 Stainless Steel | |||||
---|---|---|---|---|---|
Duct Size | Male OD | Gauge | End Construction | Each | |
3 | 2 7/8" | 20 | Spiral | 00000000 | 0000000 |
4 | 3 7/8" | 20 | Plain | 0000000 | 000000 |
5 | 4 7/8" | 20 | Spiral | 00000000 | 000000 |
6 | 5 7/8" | 20 | Plain | 0000000 | 000000 |
7 | 6 7/8" | 20 | Spiral | 00000000 | 000000 |
8 | 7 7/8" | 20 | Plain | 0000000 | 000000 |
9 | 8 7/8" | 24 | Spiral | 00000000 | 000000 |
10 | 9 7/8" | 20 | Plain | 0000000 | 000000 |
12 | 11 7/8" | 24 | Spiral | 00000000 | 000000 |
14 | 13 7/8" | 24 | Spiral | 00000000 | 000000 |
16 | 15 7/8" | 24 | Spiral | 00000000 | 000000 |
18 | 17 7/8" | 24 | Spiral | 00000000 | 000000 |
Quick-Disconnect Duct and Fittings

Join duct and fittings with quick-release clamps for faster disassembly and cleanout than other duct systems.
304 stainless steel is the most corrosion resistant.
For technical drawings and 3-D models, click on a part number.


304 Stainless Steel | ||||||
---|---|---|---|---|---|---|
Duct Size | ID | End Construction | Style | Gauge | Each | |
3 | 3 1/16" | Rolled | A | 14 | 00000000 | 0000000 |
4 | 3 7/8" | Rolled | A | 14 | 00000000 | 000000 |
5 | 4 7/8" | Rolled | A | 14 | 00000000 | 000000 |
6 | 5 7/8" | Rolled | A | 14 | 00000000 | 000000 |
7 | 6 7/8" | Rolled | B | 22 | 00000000 | 000000 |
8 | 7 7/8" | Rolled | B | 22 | 00000000 | 000000 |
9 | 8 7/8" | Rolled | B | 22 | 00000000 | 000000 |
10 | 9 7/8" | Rolled | B | 22 | 00000000 | 000000 |
12 | 12" | Rolled | B | 22 | 00000000 | 000000 |
14 | 13 15/16" | Rolled | B | 20 | 00000000 | 000000 |
16 | 16" | Rolled | B | 20 | 00000000 | 000000 |
18 | 17 15/16" | Rolled | B | 20 | 00000000 | 000000 |
20 | 19 15/16" | Rolled | B | 20 | 00000000 | 00000000 |


304 Stainless Steel | ||||||
---|---|---|---|---|---|---|
Duct Size | ID | End Construction | Style | Gauge | Each | |
3 | 3 1/16" | Rolled | A | 14 | 00000000 | 0000000 |
4 | 3 7/8" | Rolled | A | 14 | 00000000 | 000000 |
5 | 4 7/8" | Rolled | A | 14 | 00000000 | 000000 |
6 | 5 7/8" | Rolled | A | 14 | 00000000 | 000000 |
7 | 6 7/8" | Rolled | B | 22 | 00000000 | 000000 |
8 | 7 7/8" | Rolled | B | 22 | 00000000 | 000000 |
10 | 9 7/8" | Rolled | B | 22 | 00000000 | 000000 |
12 | 12" | Rolled | B | 22 | 00000000 | 000000 |
14 | 13 15/16" | Rolled | B | 20 | 00000000 | 000000 |
16 | 16" | Rolled | B | 20 | 00000000 | 000000 |
18 | 17 15/16" | Rolled | B | 20 | 00000000 | 000000 |
20 | 19 15/16" | Rolled | B | 20 | 00000000 | 000000 |


304 Stainless Steel | ||||||
---|---|---|---|---|---|---|
Duct Size | ID | End Construction | Style | Gauge | Each | |
3 | 3 1/16" | Rolled | A | 14 | 00000000 | 0000000 |
4 | 3 7/8" | Rolled | A | 14 | 00000000 | 000000 |
5 | 4 7/8" | Rolled | A | 14 | 00000000 | 000000 |
6 | 5 7/8" | Rolled | A | 14 | 00000000 | 000000 |
8 | 7 7/8" | Rolled | B | 22 | 00000000 | 000000 |
10 | 9 7/8" | Rolled | B | 22 | 00000000 | 000000 |
12 | 12" | Rolled | B | 22 | 00000000 | 000000 |
14 | 13 15/16" | Rolled | B | 20 | 00000000 | 000000 |
16 | 16" | Rolled | B | 20 | 00000000 | 000000 |
18 | 17 15/16" | Rolled | B | 20 | 00000000 | 000000 |
20 | 19 15/16" | Rolled | B | 20 | 00000000 | 000000 |