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.
Open duct can be cut with snips prior to installation. The seam snaps together without tools. Closed duct is stronger than open duct because it has a seam that is already locked in place.
Galvanized Steel | Aluminum | 304 Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
2 ft. | ||||||||||
| Trade Size | Female ID | Male OD | Gauge | End Construction | Each | 2 ft. | 2 ft. | |||
Open Duct | ||||||||||
| 3 | 3" | 2 7/8" | 26 | Crimped | 0000000 | 00000 | 000000 | 000000 | ||
| 9 | 9" | 8 7/8" | 26 | Crimped | 000000 | 00 | 000000 | 000000 | ||
Closed Duct | ||||||||||
| 4 | 4" | 3 7/8" | 24 | Crimped | 000000 | 00 | 000000 | 00000000 | ||
| 5 | 5" | 4 7/8" | 24 | Crimped | 000000 | 00 | 000000 | 0000000 | ||
| 6 | 6" | 5 7/8" | 24 | Crimped | 000000 | 00 | 000000 | 0000000 | ||
| 7 | 7" | 6 7/8" | 24 | Crimped | 000000 | 00 | 000000 | 0000000 | ||
| 8 | 8" | 7 7/8" | 24 | Crimped | 000000 | 00 | 000000 | 0000000 | ||
| 10 | 10" | 9 7/8" | 24 | Crimped | 000000 | 00 | 000000 | 0000000 | ||
Connectors with welded seams prevent leaks.
304 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|
| Trade Size | Female ID | Male OD | Features | End Construction | Gauge | Each | |
| 4 | 4" | 3 7/8" | Welded Seams | Tapered | 20 | 00000000 | 0000000 |
Connectors with welded seams prevent leaks.
Reducers connect duct with different diameters.
Trade Size | |||||||
|---|---|---|---|---|---|---|---|
| (A) | (B) | Male OD (A) | Female ID (B) | Gauge | End Construction | Each | |
Galvanized Steel | |||||||
| 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 |
| 9 | 6 | 8 7/8" | 6" | 26 | Crimped | 0000000 | 00000 |
| 9 | 8 | 8 7/8" | 8" | 26 | Crimped | 0000000 | 00000 |
| 10 | 6 | 9 7/8" | 6" | 26 | Crimped | 0000000 | 00000 |
| 10 | 8 | 9 7/8" | 8" | 26 | Crimped | 0000000 | 00000 |
| 10 | 9 | 9 7/8" | 9" | 26 | Crimped | 0000000 | 00000 |
| 12 | 6 | 11 7/8" | 6" | 26 | Crimped | 0000000 | 00000 |
| 12 | 7 | 11 7/8" | 7" | 26 | Crimped | 0000000 | 00000 |
| 12 | 8 | 11 7/8" | 8" | 26 | Crimped | 0000000 | 00000 |
| 12 | 10 | 11 7/8" | 10" | 26 | Crimped | 0000000 | 00000 |
Aluminum | |||||||
| 8 | 6 | 7 7/8" | 6" | 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 | 8 | 11 7/8" | 8" | 26 | Crimped | 0000000 | 00000 |
| 12 | 10 | 11 7/8" | 10" | 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.
Trade 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 | 00000 |
| 10 | 9 | 9 7/8" | 8 7/8" | Plain | 20 | 00000000 | 00000 |
| 12 | 10 | 11 7/8" | 9 7/8" | Plain | 20 | 00000000 | 00000 |
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 | 00000 |
| 10 | 6 | 9 7/8" | 5 7/8" | Plain | 20 | 0000000 | 00000 |
| 10 | 8 | 9 7/8" | 7 7/8" | Plain | 20 | 0000000 | 00000 |
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.
For technical drawings and 3-D models, click on a part number.
Reducers connect duct with different diameters.
Galvanized Steel | 304 Stainless Steel | ||||||
|---|---|---|---|---|---|---|---|
| Trade Size | ID | Gauge | End Construction | Each | Each | ||
| 4 | 3 7/8" | 22 | Rolled | 00000000 | 000000 | 000000 | 00 |
| 5 | 4 7/8" | 22 | Rolled | 00000000 | 00000 | 00000000 | 000000 |
| 6 | 5 7/8" | 22 | Rolled | 00000000 | 00000 | 000000 | 00 |
| 8 | 7 7/8" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 10 | 9 7/8" | 22 | Rolled | 00000000 | 00000 | 000000 | 00 |
| 12 | 12" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 14 | 13 15/16" | 20 | Rolled | 00000000 | 00000 | 000000 | 00 |
| 16 | 16" | 20 | Rolled | 00000000 | 00000 | 000000 | 00 |
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
Gaskets 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.
Tee connectors join or split runs of duct.
Galvanized Steel | |||||
|---|---|---|---|---|---|
| Trade Size | Male OD | Gauge | Gasket Material | Each | |
| 8 | 7 7/8" | 24 | EPDM Rubber | 0000000 | 000000 |
Rectangular Duct and Fittings
Often used in tight spaces, such as in walls and ceilings, rectangular duct allows you to select larger sizes without increasing duct height. Duct and fittings have interconnecting ends that lock together with brackets.
For technical drawings and 3-D models, click on a part number.
Reducer decreases duct width by 2”.
Galvanized Steel | ||||
|---|---|---|---|---|
| Wd. | Ht. | Gauge | Each | |
| 2" | 8" | 28 | 0000000 | 000000 |