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.
Galvanized steel has good corrosion resistance. Aluminum is more lightweight than steel and stainless steel and has good corrosion resistance. 304 stainless steel is more corrosion resistant than steel and aluminum.
Connectors with welded seams prevent leaks.
| Duct Size | Female ID | Male OD | Features | End Construction | Gauge | Each | |
Galvanized Steel | |||||||
|---|---|---|---|---|---|---|---|
| 14 | 14" | 13 7/8" | Welded Seams | Tapered | 20 | 00000000 | 0000000 |
| 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 |
| 22 | 22" | 21 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 24 | 24" | 23 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
Aluminum  | |||||||
| 3 | 3" | 2 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 5 | 5" | 4 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 7 | 7" | 5 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 |
304 Stainless Steel | |||||||
| 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.
| Duct Size | Female ID | Male OD | Features | End Construction | Gauge | Each | |
Galvanized Steel | |||||||
|---|---|---|---|---|---|---|---|
| 14 | 14" | 13 7/8" | Welded Seams | Tapered | 20 | 00000000 | 0000000 |
| 16 | 16" | 15 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
Aluminum | |||||||
| 3 | 3" | 2 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 5 | 5" | 4 7/8" | Welded Seams | Tapered | 20 | 00000000 | 000000 |
| 7 | 7" | 6 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 |
304 Stainless Steel | |||||||
| 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 |
Straight connectors wrap around two female duct ends to join them.
Galvanized Steel | |||||
|---|---|---|---|---|---|
| Duct Size | Female ID | Gauge | End Construction | Each | |
| 3 | 3" | 26 | Plain | 00000000 | 000000 |
| 4 | 4" | 30 | Plain | 0000000 | 00000 |
| 5 | 5" | 30 | Plain | 0000000 | 00000 |
| 6 | 6" | 30 | Plain | 0000000 | 00000 |
| 7 | 7" | 30 | Plain | 0000000 | 00000 |
| 8 | 8" | 30 | Plain | 0000000 | 00000 |
| 10 | 10" | 28 | Plain | 0000000 | 00000 |
| 12 | 12" | 26 | Plain | 0000000 | 00000 |
| 14 | 14" | 26 | Plain | 00000000 | 00000 |
| 16 | 16" | 26 | Plain | 00000000 | 00000 |
| 18 | 18" | 26 | Plain | 00000000 | 00000 |
| 20 | 20" | 26 | Plain | 00000000 | 00000 |
| 22 | 22" | 26 | Plain | 00000000 | 00000 |
| 24 | 24" | 26 | Plain | 00000000 | 00000 |
Tee connectors join or split runs of duct.
Galvanized Steel | 304 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|---|
| Duct Size | Female ID | Male OD | Gauge | End Construction | Each | Each | ||
Female × Female × Male | ||||||||
| 10 | 10" | 9 7/8" | 24 | Crimped | 000000 | 00 | 00000000 | 0000000 |
| 12 | 12" | 11 7/8" | 24 | Crimped | 000000 | 00 | 00000000 | 000000 |
| 14 | 14" | 13 7/8" | 24 | Crimped | 000000 | 00 | 00000000 | 000000 |
| 16 | 16" | 15 7/8" | 24 | Crimped | 000000 | 00 | 00000000 | 000000 |
| 18 | 18" | 17 7/8" | 24 | Crimped | 000000 | 00 | 00000000 | 000000 |
| 20 | 20" | 19 7/8" | 24 | Crimped | 00000000 | 0000000 | 00000000 | 000000 |
| 22 | 22" | 21 7/8" | 22 | Crimped | 00000000 | 000000 | 000000 | 00 |
| 24 | 24" | 23 7/8" | 22 | Crimped | 00000000 | 000000 | 000000 | 00 |
Reducers connect duct with different diameters.
Duct Size | |||||||
|---|---|---|---|---|---|---|---|
| (A) | (B) | Female ID (A) | Male OD (B) | End Construction | Gauge | Each | |
Galvanized Steel | |||||||
| 14 | 10 | 14" | 9 7/8" | Plain | 22 | 00000000 | 000000 |
| 14 | 12 | 14" | 11 7/8" | Plain | 22 | 00000000 | 00000 |
| 16 | 12 | 16" | 11 7/8" | Plain | 22 | 00000000 | 00000 |
| 16 | 14 | 16" | 13 7/8" | Plain | 22 | 00000000 | 00000 |
| 18 | 14 | 18" | 13 7/8" | Plain | 22 | 00000000 | 00000 |
| 18 | 16 | 18" | 15 7/8" | Plain | 22 | 00000000 | 00000 |
| 20 | 16 | 20" | 15 7/8" | Plain | 24 | 00000000 | 000000 |
| 22 | 18 | 22" | 17 7/8" | Plain | 24 | 00000000 | 000000 |
| 24 | 20 | 24" | 19 7/8" | Plain | 24 | 00000000 | 000000 |
Aluminum | |||||||
| 4 | 3 | 4" | 2 7/8" | Plain | 24 | 00000000 | 00000 |
| 12 | 10 | 12" | 9 7/8" | Plain | 24 | 00000000 | 00000 |
304 Stainless Steel | |||||||
| 12 | 8 | 12" | 7 7/8" | Plain | 24 | 00000000 | 000000 |
| 14 | 10 | 14" | 9 7/8" | Plain | 24 | 00000000 | 000000 |
| 16 | 12 | 16" | 11 7/8" | Plain | 24 | 00000000 | 000000 |
| 18 | 14 | 18" | 13 7/8" | Plain | 24 | 00000000 | 000000 |
| 20 | 16 | 20" | 15 7/8" | Plain | 24 | 00000000 | 000000 |
Reducers connect duct with different diameters.
Quick-Disconnect Duct and Fittings
Join duct and fittings with quick-release clamps for faster disassembly and cleanout than other duct systems.
Galvanized steel has good corrosion resistance. 304 stainless steel is the most corrosion resistant.
Adjustment sleeves extend your duct length. Cut duct, then slide on the sleeve. They include an O-ring for the clamp to grasp.
Adjustment Sleeves | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Galvanized Steel | 304 Stainless Steel | Replacement O-Rings | ||||||||
| Duct Size | ID | Gauge | Max. Sleeve Extension | End Construction | Each | Each | Each | |||
| 3 | 3 1/8" | 22 | 7" | Rolled | 00000000 | 000000 | 00000000 | 000000 | 00000000 | 00000 |
| 4 | 3 15/16" | 22 | 7" | Rolled | 0000000 | 00000 | 00000000 | 00000 | 00000000 | 0000 |
| 5 | 4 15/16" | 22 | 7" | Rolled | 0000000 | 00000 | 00000000 | 00000 | 00000000 | 0000 |
| 6 | 6" | 22 | 7" | Rolled | 0000000 | 00000 | 00000000 | 00000 | 00000000 | 0000 |
| 7 | 7" | 22 | 7" | Rolled | 00000000 | 00000 | 00000000 | 00000 | 00000000 | 0000 |
| 8 | 8" | 22 | 7" | Rolled | 00000000 | 00000 | 00000000 | 00000 | 00000000 | 0000 |
| 9 | 9" | 22 | 7" | Rolled | 00000000 | 00000 | 00000000 | 00000 | 00000000 | 0000 |
| 10 | 10" | 22 | 7" | Rolled | 00000000 | 00000 | 00000000 | 00000 | 00000000 | 0000 |
| 12 | 12 1/8" | 22 | 7" | Rolled | 00000000 | 00000 | 00000000 | 000000 | 00000000 | 0000 |
| 14 | 14 1/8" | 20 | 7" | Rolled | 00000000 | 00000 | 00000000 | 000000 | 00000000 | 00000 |
| 16 | 16 1/8" | 20 | 7" | Rolled | 00000000 | 00000 | 00000000 | 000000 | 00000000 | 00000 |
| 18 | 18" | 20 | 7" | Rolled | 00000000 | 00000 | 000000 | 00 | 00000000 | 00000 |
| 18 | 18 1/16" | 20 | 7" | Rolled | 00000000 | 00000 | 000000 | 00 | 00000000 | 00000 |
| 20 | 20" | 20 | 7" | Rolled | 00000000 | 00000 | 000000 | 00 | 00000000 | 00000 |
| 20 | 20 1/16" | 20 | 7" | Rolled | 000000 | 00 | 00000000 | 000000 | 00000000 | 00000 |
| 22 | 22" | 20 | 7" | Rolled | 00000000 | 00000 | 000000 | 00 | 00000000 | 00000 |
| 24 | 24" | 20 | 7" | Rolled | 00000000 | 000000 | 000000 | 00 | 00000000 | 00000 |
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.
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.
Male straight connectors are required to connect two pieces of duct.
Female straight connectors join two fittings.
| Duct Size | Female ID | Male OD | End Construction | Gauge | Each | |
Galvanized Steel | ||||||
|---|---|---|---|---|---|---|
Male | ||||||
| 3 | __ | 2 7/8" | Plain | 24 | 0000000 | 000000 |
| 4 | __ | 3 7/8" | Plain | 24 | 0000000 | 00000 |
| 5 | __ | 4 7/8" | Plain | 24 | 0000000 | 00000 |
| 6 | __ | 5 7/8" | Plain | 24 | 0000000 | 00000 |
| 8 | __ | 7 7/8" | Plain | 24 | 0000000 | 00000 |
| 10 | __ | 9 7/8" | Plain | 24 | 0000000 | 00000 |
| 12 | __ | 11 7/8" | Plain | 24 | 0000000 | 00000 |
| 14 | __ | 13 7/8" | Plain | 22 | 0000000 | 00000 |
| 16 | __ | 15 7/8" | Plain | 22 | 0000000 | 00000 |
Female | ||||||
| 3 | 3" | __ | Plain | 24 | 00000000 | 0000 |
| 4 | 4" | __ | Plain | 24 | 00000000 | 0000 |
| 5 | 5" | __ | Plain | 24 | 00000000 | 0000 |
| 6 | 6" | __ | Plain | 24 | 00000000 | 0000 |
| 8 | 8" | __ | Plain | 24 | 00000000 | 0000 |
| 10 | 10" | __ | Plain | 24 | 00000000 | 00000 |
| 12 | 12" | __ | Plain | 24 | 00000000 | 00000 |
| 14 | 14" | __ | Plain | 22 | 00000000 | 00000 |
| 16 | 16" | __ | Plain | 22 | 00000000 | 00000 |
PVC-Coated Steel | ||||||
Male | ||||||
| 4 | __ | 3 7/8" | Plain | 26 | 00000000 | 00000 |
| 5 | __ | 4 7/8" | Plain | 26 | 00000000 | 00000 |
| 6 | __ | 5 7/8" | Plain | 26 | 00000000 | 00000 |
| 7 | __ | 6 7/8" | Plain | 26 | 00000000 | 00000 |
| 8 | __ | 7 7/8" | Plain | 26 | 00000000 | 00000 |
| 9 | __ | 8 7/8" | Plain | 26 | 00000000 | 00000 |
| 10 | __ | 9 7/8" | Plain | 26 | 00000000 | 00000 |
| 12 | __ | 11 7/8" | Plain | 26 | 00000000 | 00000 |
304 Stainless Steel | ||||||
Male | ||||||
| 4 | __ | 3 7/8" | Plain | 24 | 0000000 | 00000 |
| 6 | __ | 5 7/8" | Plain | 24 | 0000000 | 00000 |
| 8 | __ | 7 7/8" | Plain | 24 | 0000000 | 00000 |
| 10 | __ | 9 7/8" | Plain | 24 | 0000000 | 00000 |
Sure-Seal Spiral Duct and Fittings
Fittings have gaskets which create a tight seal—you don't need to seal joints with coating or tape. Fittings have male ends with a slightly smaller diameter to press-fit into duct. These duct and fittings are compatible with Crush-Resistant Spiral Duct and Fittings.
