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.
For technical drawings and 3-D models, click on a part number.
Reducers connect duct with different diameters.
Duct Size | |||||||
|---|---|---|---|---|---|---|---|
| (A) | (B) | Female ID (A) | Male OD (B) | End Construction | Gauge | Each | |
Galvanized Steel | |||||||
| 4 | 3 | 4" | 2 15/16" | Crimped | 26 | 0000000 | 000000 |
| 5 | 4 | 5" | 3 7/8" | Crimped | 26 | 0000000 | 00000 |
| 6 | 4 | 6" | 3 15/16" | Crimped | 26 | 0000000 | 00000 |
| 6 | 5 | 6" | 4 7/8" | Crimped | 26 | 0000000 | 00000 |
| 7 | 6 | 7" | 5 7/8" | Crimped | 26 | 0000000 | 00000 |
| 8 | 6 | 8" | 5 15/16" | Crimped | 26 | 0000000 | 00000 |
| 8 | 7 | 8" | 6 7/8" | Crimped | 26 | 0000000 | 00000 |
| 9 | 8 | 9" | 7 15/16" | Crimped | 26 | 0000000 | 00000 |
| 10 | 6 | 10" | 5 7/8" | Crimped | 26 | 0000000 | 00000 |
| 10 | 7 | 10" | 6 7/8" | Crimped | 26 | 0000000 | 00000 |
| 10 | 8 | 10" | 7 7/8" | Crimped | 26 | 0000000 | 00000 |
| 12 | 6 | 12" | 5 7/8" | Crimped | 26 | 0000000 | 00000 |
| 12 | 7 | 12" | 6 7/8" | Crimped | 26 | 0000000 | 00000 |
| 12 | 8 | 12" | 7 7/8" | Crimped | 26 | 0000000 | 00000 |
| 12 | 10 | 12" | 9 7/8" | Crimped | 26 | 0000000 | 00000 |
Aluminum  | |||||||
| 6 | 4 | 6" | 3 7/8" | Crimped | 26 | 0000000 | 00000 |
| 7 | 4 | 7" | 3 7/8" | Crimped | 24 | 0000000 | 00000 |
304 Stainless Steel | |||||||
| 4 | 3 | 4" | 2 7/8" | Crimped | 26 | 0000000 | 00000 |
| 6 | 4 | 6" | 3 7/8" | Crimped | 26 | 0000000 | 00000 |
| 8 | 4 | 8" | 3 7/8" | Crimped | 26 | 0000000 | 00000 |
| 8 | 6 | 8" | 5 7/8" | Crimped | 26 | 0000000 | 00000 |
Reducers connect duct with different diameters.
Duct Size | Galvanized Steel | ||||||
|---|---|---|---|---|---|---|---|
| (A) | (B) | Male OD (A) | Female ID (B) | Gauge | End Construction | Each | |
| 6 | 4 | 5 7/8" | 4" | 26 | Crimped | 0000000 | 000000 |
| 7 | 6 | 6 7/8" | 6" | 26 | Crimped | 0000000 | 00000 |
| 8 | 6 | 7 7/8" | 6" | 26 | Crimped | 0000000 | 00000 |
| 8 | 7 | 7 7/8" | 7" | 26 | Crimped | 0000000 | 00000 |
| 10 | 6 | 9 7/8" | 6" | 26 | Crimped | 0000000 | 00000 |
| 10 | 8 | 9 7/8" | 8" | 26 | Crimped | 0000000 | 00000 |
| 12 | 6 | 11 7/8" | 6" | 26 | Crimped | 0000000 | 00000 |
| 12 | 8 | 11 7/8" | 8" | 26 | Crimped | 0000000 | 00000 |
| 12 | 10 | 11 7/8" | 10" | 26 | Crimped | 0000000 | 00000 |
| 14 | 10 | 13 7/8" | 10" | 28 | Crimped | 0000000 | 00000 |
| 14 | 12 | 13 7/8" | 12" | 28 | Crimped | 0000000 | 00000 |
| 16 | 12 | 15 7/8" | 12" | 26 | Crimped | 0000000 | 00000 |
| 16 | 14 | 15 7/8" | 14" | 28 | Crimped | 0000000 | 00000 |
| 18 | 16 | 17 7/8" | 16" | 26 | Crimped | 0000000 | 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.
For technical drawings and 3-D models, click on a part number.
Reducers connect duct with different diameters.
Duct Size | Male OD | ||||||
|---|---|---|---|---|---|---|---|
| (A) | (B) | (A) | (B) | End Construction | Gauge | Each | |
Galvanized Steel | |||||||
| 4 | 3 | 3 7/8" | 2 7/8" | Plain | 24 | 0000000 | 000000 |
| 5 | 4 | 4 7/8" | 3 7/8" | Plain | 24 | 0000000 | 00000 |
| 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 | 6 | 9 7/8" | 5 7/8" | Plain | 24 | 0000000 | 00000 |
| 10 | 8 | 9 7/8" | 7 7/8" | Plain | 24 | 0000000 | 00000 |
| 12 | 6 | 11 7/8" | 5 7/8" | Plain | 24 | 0000000 | 00000 |
| 12 | 8 | 11 7/8" | 7 7/8" | Plain | 24 | 0000000 | 00000 |
| 12 | 10 | 11 7/8" | 9 7/8" | Plain | 24 | 0000000 | 00000 |
| 14 | 12 | 13 7/8" | 11 7/8" | Plain | 24 | 0000000 | 00000 |
| 16 | 14 | 15 7/8" | 13 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 | 6 | 9 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
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.
Reducers connect duct with different diameters.
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.
For technical drawings and 3-D models, click on a part number.
Reducers connect duct with different diameters.
Duct Size | Male OD | Galvanized Steel | |||||
|---|---|---|---|---|---|---|---|
| (A) | (B) | (A) | (B) | Gauge | Gasket Material | Each | |
| 6 | 4 | 5 7/8" | 3 7/8" | 20 | EPDM Rubber | 0000000 | 000000 |
| 8 | 6 | 7 7/8" | 5 7/8" | 20 | EPDM Rubber | 0000000 | 00000 |
| 10 | 6 | 9 7/8" | 5 7/8" | 20 | EPDM Rubber | 0000000 | 00000 |
| 10 | 8 | 9 7/8" | 7 7/8" | 20 | EPDM Rubber | 0000000 | 00000 |
| 12 | 10 | 11 7/8" | 9 7/8" | 20 | EPDM Rubber | 0000000 | 00000 |
| 12 | 8 | 11 7/8" | 7 7/8" | 20 | EPDM Rubber | 0000000 | 00000 |
Duct Noise Reducers
Mount these noise reducers directly to spiral duct to decrease noise by as much as 50%. The rubber gaskets on each end create a tight seal.
For technical drawings and 3-D models, click on a part number.
Overall | Galvanized Steel | ||||||
|---|---|---|---|---|---|---|---|
| Duct Size | Male OD | Dia. | Lg. | Gauge | Connection Type | Each | |
| 4 | 3 7/8" | 8 1/4" | 23 5/8" | 24 | Press Fit | 000000 | 0000000 |
| 5 | 4 7/8" | 9 1/4" | 23 5/8" | 24 | Press Fit | 000000 | 000000 |
| 6 | 5 7/8" | 10 5/8" | 23 5/8" | 24 | Press Fit | 000000 | 000000 |
| 8 | 7 7/8" | 12 3/4" | 23 5/8" | 24 | Press Fit | 000000 | 000000 |
| 10 | 9 7/8" | 14 3/8" | 35 3/8" | 24 | Press Fit | 000000 | 000000 |
| 12 | 12 3/8" | 16 3/4" | 35 3/8" | 24 | Press Fit | 000000 | 000000 |