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About Duct Connections
More
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 | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Duct Size | Female ID | Male OD | Gauge | End Construction | 2 ft. | 5 ft. | 2 ft. | 5 ft. | 2 ft. | 3 ft. | 5 ft. | |||
Open Duct | ||||||||||||||
3 | 3" | 2 7/8" | 26 | Crimped | 0000000 | 0000000 | 000000 | |||||||
4 | 4" | 3 7/8" | __ | Crimped | 000000 | 000000 | 000000 | |||||||
4 | 4" | 3 7/8" | 26 | Crimped | 000000 | 000000 | 000000 | |||||||
5 | 5" | 4 7/8" | 26 | Crimped | 000000 | 0000000 | 0000000 | |||||||
6 | 6" | 5 7/8" | 26 | Crimped | 000000 | 00000000 | 000000 | |||||||
7 | 7" | 6 7/8" | 26 | Crimped | 000000 | 000000 | 000000 | |||||||
8 | 8" | 7 7/8" | 26 | Crimped | 000000 | 0000000 | 000000 | |||||||
9 | 9" | 8 7/8" | 26 | Crimped | 000000 | 000000 | 000000 | |||||||
10 | 10" | 9 7/8" | 26 | Crimped | 000000 | 000000 | 0000000 | |||||||
12 | 12" | 11 7/8" | 26 | Crimped | 000000 | 000000 | 000000 | |||||||
14 | 14" | 13 7/8" | 26 | Crimped | 000000 | 000000 | 000000 | |||||||
16 | 16" | 15 7/8" | 26 | Crimped | 0000000 | 000000 | 000000 | |||||||
18 | 18" | 17 7/8" | 26 | Crimped | 0000000 | 000000 | 000000 | |||||||
20 | 20" | 19 7/8" | 24 | Crimped | 0000000 | 000000 | 000000 | |||||||
22 | 22" | 21 7/8" | 24 | Crimped | 0000000 | 000000 | 000000 | |||||||
24 | 24" | 23 7/8" | 24 | Crimped | 0000000 | 000000 | 000000 | |||||||
Closed Duct | ||||||||||||||
3 | 3" | 2 7/8" | 24 | Crimped | 0000000 | 000000 | 000000 | |||||||
4 | 4" | 3 7/8" | 24 | Crimped | 0000000 | 000000 | 00000000 | |||||||
5 | 5" | 4 7/8" | 24 | Crimped | 0000000 | 000000 | 0000000 | |||||||
6 | 6" | 5 7/8" | 24 | Crimped | 0000000 | 000000 | 0000000 | |||||||
7 | 7" | 6 7/8" | 24 | Crimped | 0000000 | 000000 | 0000000 | |||||||
8 | 8" | 7 7/8" | 24 | Crimped | 0000000 | 000000 | 0000000 | |||||||
10 | 10" | 9 7/8" | 24 | Crimped | 0000000 | 000000 | 0000000 | |||||||
12 | 12" | 11 7/8" | 24 | Crimped | 0000000 | 000000 | 0000000 |

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 | 10 | 12" | 9 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 |
Aluminum | |||||||
6 | 4 | 6" | 3 7/8" | Crimped | 24 | 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 |
10 | 6 | 10" | 5 7/8" | Crimped | 26 | 0000000 | 000000 |

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 | 10 | 11 7/8" | 10" | 26 | Crimped | 0000000 | 00000 |
12 | 6 | 11 7/8" | 6" | 26 | Crimped | 0000000 | 00000 |
12 | 8 | 11 7/8" | 8" | 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" | 28 | 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. 304 stainless steel is more corrosion resistant than steel.
For technical drawings and 3-D models, click on a part number.

Galvanized Steel | 304 Stainless Steel | |||||||||
---|---|---|---|---|---|---|---|---|---|---|
Duct Size | Female ID | End Construction | Gauge | 2 ft. | 5 ft. | Gauge | 2 ft. | 5 ft. | ||
3 | 3" | Plain | 26 | 0000000 | __ | 000000 | ||||
4 | 4" | Plain | 26 | 00000000 | 24 | 00000000 | ||||
5 | 5" | Plain | 26 | 00000000 | __ | 000000 | ||||
6 | 6" | Plain | 26 | 00000000 | 24 | 00000000 | ||||
8 | 8" | Plain | 26 | 00000000 | 24 | 00000000 | ||||
10 | 10" | Plain | 26 | 00000000 | 24 | 00000000 | ||||
12 | 12" | Plain | 26 | 00000000 | __ | 000000 | ||||
14 | 14" | Plain | 24 | 00000000 | __ | 000000 | ||||
16 | 16" | Plain | 24 | 00000000 | __ | 000000 |


Male straight connectors are required to connect two pieces of duct.
Female straight connectors join two fittings.
Galvanized Steel | 304 Stainless Steel | ||||||||
---|---|---|---|---|---|---|---|---|---|
Duct Size | Female ID | Male OD | End Construction | Gauge | Each | Gauge | Each | ||
Male | |||||||||
3 | __ | 2 7/8" | Plain | 24 | 0000000 | 000000 | __ | 000000 | 00 |
4 | __ | 3 7/8" | Plain | 24 | 0000000 | 00000 | 24 | 0000000 | 000000 |
5 | __ | 4 7/8" | Plain | 24 | 0000000 | 00000 | __ | 000000 | 00 |
6 | __ | 5 7/8" | Plain | 24 | 0000000 | 00000 | 24 | 0000000 | 00000 |
8 | __ | 7 7/8" | Plain | 24 | 0000000 | 00000 | 24 | 0000000 | 00000 |
10 | __ | 9 7/8" | Plain | 24 | 0000000 | 00000 | 24 | 0000000 | 00000 |
12 | __ | 11 7/8" | Plain | 24 | 0000000 | 00000 | __ | 000000 | 00 |
14 | __ | 13 7/8" | Plain | 22 | 0000000 | 00000 | __ | 000000 | 00 |
16 | __ | 15 7/8" | Plain | 22 | 0000000 | 00000 | __ | 000000 | 00 |
Female | |||||||||
3 | 3" | __ | Plain | 24 | 00000000 | 0000 | __ | 000000 | 00 |
4 | 4" | __ | Plain | 24 | 00000000 | 0000 | __ | 000000 | 00 |
5 | 5" | __ | Plain | 24 | 00000000 | 0000 | __ | 000000 | 00 |
6 | 6" | __ | Plain | 24 | 00000000 | 0000 | __ | 000000 | 00 |
8 | 8" | __ | Plain | 24 | 00000000 | 0000 | __ | 000000 | 00 |
10 | 10" | __ | Plain | 24 | 00000000 | 00000 | __ | 000000 | 00 |
12 | 12" | __ | Plain | 24 | 00000000 | 00000 | __ | 000000 | 00 |
14 | 14" | __ | Plain | 22 | 00000000 | 00000 | __ | 000000 | 00 |
16 | 16" | __ | Plain | 22 | 00000000 | 00000 | __ | 000000 | 00 |

Reducers connect duct with different diameters.
Duct Size | Male OD | Galvanized Steel | 304 Stainless Steel | |||||||
---|---|---|---|---|---|---|---|---|---|---|
(A) | (B) | (A) | (B) | End Construction | Gauge | Each | Gauge | Each | ||
4 | 3 | 3 7/8" | 2 7/8" | Plain | 24 | 0000000 | 000000 | __ | 000000 | 00 |
5 | 4 | 4 7/8" | 3 7/8" | Plain | 24 | 0000000 | 00000 | __ | 000000 | 00 |
6 | 4 | 5 7/8" | 3 7/8" | Plain | 24 | 0000000 | 00000 | 20 | 0000000 | 000000 |
6 | 5 | 5 7/8" | 4 7/8" | Plain | 24 | 0000000 | 00000 | __ | 000000 | 00 |
8 | 6 | 7 7/8" | 5 7/8" | Plain | 24 | 0000000 | 00000 | 20 | 0000000 | 000000 |
10 | 6 | 9 7/8" | 5 7/8" | Plain | 24 | 0000000 | 00000 | 20 | 0000000 | 000000 |
10 | 8 | 9 7/8" | 7 7/8" | Plain | 24 | 0000000 | 00000 | 20 | 0000000 | 000000 |
12 | 10 | 11 7/8" | 9 7/8" | Plain | 24 | 0000000 | 00000 | __ | 000000 | 00 |
12 | 6 | 11 7/8" | 5 7/8" | Plain | 24 | 0000000 | 00000 | __ | 000000 | 00 |
12 | 8 | 11 7/8" | 7 7/8" | Plain | 24 | 0000000 | 00000 | __ | 000000 | 00 |
14 | 12 | 13 7/8" | 11 7/8" | Plain | 24 | 0000000 | 00000 | __ | 000000 | 00 |
16 | 14 | 15 7/8" | 13 7/8" | Plain | 24 | 0000000 | 00000 | __ | 000000 | 00 |
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 |
Automatic Airflow Dampers

Save energy and increase comfort by heating and cooling only the areas that need it. Dampers automatically close when signaled by a thermostat or switch (not included).
For technical drawings and 3-D models, click on a part number.
Overall | Galvanized Steel | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Duct Size | Female ID | Male OD | Ht. | Wd. | Gauge | Electrical Connection Type | Voltage | End Construction | Connection Type | Each | |
5 | 5" | 4 7/8" | 9 1/4" | 7" | 24 | Hardwire | 24V AC | Crimped | Press Fit | 0000000 | 0000000 |
6 | 6" | 5 7/8" | 10 1/4" | 8" | 24 | Hardwire | 24V AC | Crimped | Press Fit | 0000000 | 000000 |
7 | 7" | 6 7/8" | 11 1/4" | 9" | 24 | Hardwire | 24V AC | Crimped | Press Fit | 0000000 | 000000 |
8 | 8" | 7 7/8" | 12 1/4" | 10" | 24 | Hardwire | 24V AC | Crimped | Press Fit | 0000000 | 000000 |
9 | 9" | 8 7/8" | 13 1/4" | 11" | 24 | Hardwire | 24V AC | Crimped | Press Fit | 0000000 | 000000 |
10 | 10" | 9 7/8" | 14 1/4" | 12" | 24 | Hardwire | 24V AC | Crimped | Press Fit | 0000000 | 000000 |
12 | 12" | 11 7/8" | 16 1/4" | 14" | 24 | Hardwire | 24V AC | Crimped | Press Fit | 0000000 | 000000 |
14 | 14" | 13 7/8" | 18 1/4" | 16" | 22 | Hardwire | 24V AC | Crimped | Press Fit | 0000000 | 000000 |
16 | 16" | 15 7/8" | 20 1/4" | 18" | 22 | Hardwire | 24V AC | Crimped | Press Fit | 0000000 | 000000 |
18 | 18" | 17 7/8" | 22 1/4" | 20" | 22 | Hardwire | 24V AC | Crimped | Press Fit | 0000000 | 000000 |
20 | 20" | 19 7/8" | 24 1/4" | 22" | 22 | Hardwire | 24V AC | Crimped | Press Fit | 0000000 | 000000 |
Gas Chimney Vents and Fittings
For use with gas-fired equipment, such as boilers and furnaces, these vent pipes and fittings withstand temperatures up to 400° F. Also known as type B gas vents.
To join pipes and connectors, insert a male end into a female end and secure with the included locking band.
For technical drawings and 3-D models, click on a part number.

Galvanized Steel | |||||||||
---|---|---|---|---|---|---|---|---|---|
Chimney Pipe Size | Female ID | Male OD | Lg. | Gauge | Construction | Inner Wall Material | Specifications Met | Each | |
4 | 4" | 4 1/2" | 18" | 28 | Double Wall | Aluminum | UL Listed | 0000000 | 000000 |
5 | 5" | 5 1/2" | 18" | 28 | Double Wall | Aluminum | UL Listed | 0000000 | 00000 |
6 | 6" | 6 1/2" | 18" | 28 | Double Wall | Aluminum | UL Listed | 0000000 | 00000 |
7 | 7" | 8" | 18" | 28 | Double Wall | Aluminum | UL Listed | 0000000 | 00000 |
8 | 8" | 9" | 18" | 28 | Double Wall | Aluminum | UL Listed | 0000000 | 00000 |
High-Temperature Chimney Vents and Fittings
Built to withstand temperatures up to 1000° F, these vent pipes and fittings are for use with boilers, furnaces, stoves, and other equipment that is fired by gas, oil, wood, or coal.
To join pipes and connectors, twist a male end into a female end and secure with the included locking band.

304 Stainless Steel | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
18" Lg. | 36" Lg. | |||||||||
Chimney Pipe Size | Female ID | Male OD | Gauge | Construction | Insulation Thick. | Specifications Met | Each | Each | ||
6 | 6" | 8" | 28 | Double Wall | 1" | UL Listed | 0000000 | 0000000 | 00000000 | 0000000 |
8 | 8" | 10" | 28 | Double Wall | 1" | UL Listed | 0000000 | 000000 | 00000000 | 000000 |
10 | 10" | 12" | 28 | Double Wall | 1" | UL Listed | 0000000 | 000000 | 00000000 | 000000 |
12 | 12" | 14" | 28 | Double Wall | 1" | UL Listed | 0000000 | 000000 | 00000000 | 000000 |