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.
For technical drawings and 3-D models, click on a part number.
Reducers connect duct with different diameters.
Duct Size | Galvanized Steel | ||||||
|---|---|---|---|---|---|---|---|
| (A) | (B) | Female ID (A) | Male OD (B) | End Construction | Gauge | Each | |
| 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 |
| 14 | 10 | 14" | 9 7/8" | Plain | 22 | 00000000 | 00000 |
| 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 |
Reducers connect duct with different diameters.
Duct Size | Galvanized Steel | ||||||
|---|---|---|---|---|---|---|---|
| (A) | (B) | Male OD (A) | Female ID (B) | Gauge | End Construction | Each | |
| 4 | 3 | 3 7/8" | 3" | 24 | Plain | 00000000 | 000000 |
| 5 | 4 | 4 7/8" | 4" | 24 | Plain | 00000000 | 00000 |
| 6 | 4 | 5 7/8" | 4" | 26 | Crimped | 0000000 | 00000 |
| 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 | 14 | 17 7/8" | 14" | 24 | Plain | 00000000 | 00000 |
| 18 | 16 | 17 7/8" | 16" | 26 | Crimped | 0000000 | 00000 |
| 20 | 18 | 19 15/16" | 18" | 24 | Crimped | 00000000 | 00000 |
| 22 | 20 | 21 15/16" | 20" | 24 | Crimped | 00000000 | 00000 |
| 24 | 22 | 23 15/16" | 22" | 24 | Crimped | 00000000 | 00000 |
Reducers connect duct with different diameters.
Duct Size | Female ID | Male OD | Galvanized Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| (A) | (B) | (C) | (A) | (B) | (C) | (A) | (B) | (C) | Gauge | End Construction | Each | |
Female × Male × Male | ||||||||||||
| 12 | 10 | 10 | 12" | __ | __ | __ | 9 7/8" | 9 7/8" | 28 | Crimped | 00000000 | 0000000 |
| 14 | 10 | 10 | 14" | __ | __ | __ | 9 7/8" | 9 7/8" | 28 | Crimped | 00000000 | 000000 |
| 16 | 12 | 12 | 16" | __ | __ | __ | 11 7/8" | 11 7/8" | 26 | Crimped | 00000000 | 000000 |
| 16 | 14 | 14 | 16" | __ | __ | __ | 13 7/8" | 13 7/8" | 26 | Crimped | 00000000 | 000000 |
Male × Female × Female | ||||||||||||
| 4 | 3 | 3 | __ | 3" | 3" | 3 7/8" | __ | __ | 26 | Crimped | 00000000 | 00000 |
| 5 | 3 | 4 | __ | 3" | 4" | 4 7/8" | __ | __ | 26 | Crimped | 00000000 | 00000 |
| 5 | 3 | 5 | __ | 3" | 5" | 4 7/8" | __ | __ | 26 | Crimped | 00000000 | 00000 |
| 6 | 3 | 4 | __ | 3" | 4" | 5 7/8" | __ | __ | 26 | Crimped | 00000000 | 00000 |
| 6 | 4 | 4 | __ | 4" | 4" | 5 7/8" | __ | __ | 26 | Crimped | 00000000 | 00000 |
| 6 | 4 | 5 | __ | 4" | 5" | 5 7/8" | __ | __ | 26 | Crimped | 00000000 | 00000 |
| 7 | 5 | 6 | __ | 5" | 6" | 6 7/8" | __ | __ | 26 | Crimped | 00000000 | 00000 |
| 8 | 6 | 6 | __ | 6" | 6" | 7 7/8" | __ | __ | 26 | Crimped | 00000000 | 00000 |
| 10 | 8 | 8 | __ | 8" | 8" | 9 7/8" | __ | __ | 26 | Crimped | 00000000 | 000000 |
| 12 | 8 | 8 | __ | 8" | 8" | 11 7/8" | __ | __ | 26 | Crimped | 00000000 | 000000 |
Reducers connect duct with different diameters.
Duct Size | Male OD | Galvanized Steel | |||||||
|---|---|---|---|---|---|---|---|---|---|
| (A) | (B) | (C) | Female ID (A) | (B) | (C) | Gauge | End Construction | Each | |
Female × Male × Male | |||||||||
| 4 | 3 | 4 | 4" | 2 7/8" | 3 7/8" | 26 | Crimped | 00000000 | 000000 |
| 5 | 3 | 5 | 5" | 2 7/8" | 4 7/8" | 26 | Crimped | 0000000 | 00000 |
| 6 | 3 | 6 | 6" | 2 7/8" | 5 7/8" | 26 | Crimped | 0000000 | 00000 |
| 6 | 4 | 6 | 6" | 3 7/8" | 5 7/8" | 26 | Crimped | 0000000 | 00000 |
| 8 | 6 | 6 | 8" | 5 7/8" | 5 7/8" | 24 | Plain | 00000000 | 000000 |
| 10 | 8 | 8 | 10" | 7 7/8" | 7 7/8" | 24 | Plain | 00000000 | 000000 |
| 12 | 8 | 8 | 12" | 7 7/8" | 7 7/8" | 24 | Plain | 00000000 | 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.
Galvanized steel has good corrosion resistance.
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) | End Construction | Gauge | Each | |
| 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 |
| 7 | 6 | 6 7/8" | 5 7/8" | Plain | 24 | 00000000 | 00000 |
| 8 | 6 | 7 7/8" | 5 7/8" | Plain | 24 | 0000000 | 00000 |
| 8 | 7 | 7 7/8" | 6 7/8" | Plain | 24 | 00000000 | 00000 |
| 9 | 8 | 8 7/8" | 7 7/8" | Plain | 24 | 00000000 | 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 |
| 10 | 9 | 9 7/8" | 8 7/8" | Plain | 24 | 00000000 | 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 |
| 18 | 16 | 17 7/8" | 15 7/8" | Plain | 22 | 00000000 | 00000 |
| 20 | 18 | 19 7/8" | 17 7/8" | Plain | 24 | 00000000 | 000000 |
| 22 | 20 | 21 7/8" | 19 7/8" | Plain | 24 | 00000000 | 000000 |
| 24 | 22 | 23 7/8" | 21 7/8" | Plain | 24 | 00000000 | 000000 |
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.
For technical drawings and 3-D models, click on a part number.
Reducers connect duct with different diameters.
Duct Size | ID | Galvanized Steel | |||||
|---|---|---|---|---|---|---|---|
| (A) | (B) | (A) | (B) | Gauge | End Construction | Each | |
| 4 | 3 | 3 7/8" | 3 1/16" | 22 | Rolled | 00000000 | 000000 |
| 5 | 4 | 4 7/8" | 3 7/8" | 22 | Rolled | 00000000 | 00000 |
| 6 | 4 | 5 7/8" | 3 7/8" | 22 | Rolled | 0000000 | 00000 |
| 6 | 5 | 5 7/8" | 4 7/8" | 22 | Rolled | 0000000 | 00000 |
| 8 | 6 | 7 7/8" | 5 7/8" | 22 | Rolled | 00000000 | 00000 |
| 10 | 6 | 9 7/8" | 5 7/8" | 22 | Rolled | 00000000 | 00000 |
| 10 | 8 | 9 7/8" | 7 7/8" | 22 | Rolled | 00000000 | 00000 |
| 12 | 8 | 12" | 7 7/8" | 22 | Rolled | 00000000 | 000000 |
| 12 | 10 | 12" | 9 7/8" | 22 | Rolled | 00000000 | 000000 |
| 14 | 12 | 13 15/16" | 12" | 22 | Rolled | 00000000 | 000000 |
| 16 | 14 | 16" | 14" | 20 | Rolled | 00000000 | 000000 |
| 18 | 16 | 17 15/16" | 16" | 20 | Rolled | 00000000 | 000000 |
| 20 | 18 | 19 15/16" | 17 15/16" | 20 | Rolled | 00000000 | 000000 |
| 22 | 20 | 22" | 19 15/16" | 20 | Rolled | 00000000 | 000000 |
| 24 | 22 | 23 15/16" | 22" | 20 | Rolled | 00000000 | 000000 |
Galvanized Steel | |||||
|---|---|---|---|---|---|
| Duct Size | Sound Absorbed | Gauge | End Construction | Each | |
| 3 | 25% | 20 | Rolled | 00000000 | 0000000 |
| 4 | 25% | 20 | Rolled | 00000000 | 000000 |
| 7 | 25% | 20 | Rolled | 00000000 | 00000000 |
| 8 | 25% | 20 | Rolled | 00000000 | 00000000 |
| 9 | 25% | 20 | Rolled | 00000000 | 00000000 |
| 5 | 25% | 20 | Rolled | 00000000 | 000000 |
| 6 | 25% | 20 | Rolled | 00000000 | 000000 |
| 10 | 25% | 20 | Rolled | 00000000 | 00000000 |
| 12 | 25% | 20 | Rolled | 00000000 | 00000000 |
| 14 | 25% | 20 | Rolled | 00000000 | 00000000 |
| 16 | 25% | 20 | Rolled | 00000000 | 00000000 |
| 18 | 25% | 20 | Rolled | 00000000 | 00000000 |
| 20 | 25% | 20 | Rolled | 00000000 | 00000000 |
| 22 | 25% | 20 | Rolled | 00000000 | 00000000 |
| 24 | 25% | 20 | Rolled | 00000000 | 00000000 |
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 |
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.
Reducers decrease duct width by 2”.
Galvanized Steel | ||||
|---|---|---|---|---|
| Wd. | Ht. | Gauge | Each | |
| 2" | 8" | 28 | 0000000 | 000000 |
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 |
Duct Hose Connectors
Slide these connectors into the ends of duct hose and secure with a clamp.
Galvanized steel has fair corrosion resistance.
For technical drawings and 3-D models, click on a part number.
For Hose ID | |||||||
|---|---|---|---|---|---|---|---|
| A | B | Lg. | Shape | Temperature Range, ° F | Material Thick. | Each | |
Galvanized Steel | |||||||
| 4" | 3" | 7" | Straight | -100° to 550° | 0.028" | 0000000 | 000000 |
| 6" | 4" | 7" | Straight | -100° to 550° | 0.028" | 0000000 | 00000 |
| 8" | 6" | 7" | Straight | -100° to 550° | 0.028" | 0000000 | 00000 |
| 10" | 8" | 7 1/4" | Straight | -100° to 550° | 0.028" | 0000000 | 00000 |
| 12" | 8" | 8 1/4" | Straight | -100° to 550° | 0.028" | 0000000 | 00000 |
| 12" | 10" | 7 1/2" | Straight | -100° to 550° | 0.028" | 0000000 | 00000 |