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.
Galvanized Steel | Aluminum | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Duct Size | Female ID | Male OD | Includes | End Construction | Gauge | Each | Gauge | Each | ||
Exhaust Vent | ||||||||||
| 3 | 3" | __ | Damper | Plain | __ | 000000 | 00 | 30 | 0000000 | 000000 |
| 4 | 4" | __ | Damper | Plain | 30 | 00000000 | 000000 | 30 | 0000000 | 00000 |
| 5 | 5" | __ | Damper | Plain | 30 | 00000000 | 00000 | __ | 000000 | 00 |
| 6 | 6" | __ | Damper | Plain | 30 | 00000000 | 00000 | 22 | 0000000 | 00000 |
| 7 | 7" | __ | Damper | Plain | 30 | 00000000 | 00000 | __ | 000000 | 00 |
| 8 | 8" | __ | Damper | Plain | 30 | 00000000 | 00000 | 22 | 0000000 | 000000 |
Intake Vent | ||||||||||
| 4 | __ | 3 7/8" | Screen | Crimped | 30 | 00000000 | 00000 | __ | 000000 | 00 |
| 5 | __ | 4 7/8" | Screen | Crimped | 30 | 00000000 | 00000 | __ | 000000 | 00 |
| 6 | __ | 5 7/8" | Screen | Crimped | 30 | 00000000 | 00000 | __ | 000000 | 00 |
| 7 | __ | 6 7/8" | Screen | Crimped | 30 | 00000000 | 00000 | __ | 000000 | 00 |
| 8 | __ | 7 7/8" | Screen | Crimped | 30 | 00000000 | 00000 | __ | 000000 | 00 |
Galvanized Steel | 304 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|---|
| Duct Size | Female ID | End Construction | Gauge | Each | Gauge | Each | ||
| 3 | 3" | Plain | 26 | 0000000 | 000000 | __ | 000000 | 00 |
| 4 | 4" | Plain | 26 | 0000000 | 00000 | 26 | 0000000 | 000000 |
| 5 | 5" | Plain | 26 | 0000000 | 00000 | __ | 000000 | 00 |
| 6 | 6" | Plain | 26 | 0000000 | 00000 | 26 | 0000000 | 00000 |
| 7 | 7" | Plain | 26 | 0000000 | 00000 | __ | 000000 | 00 |
| 8 | 8" | Plain | 26 | 0000000 | 00000 | 26 | 0000000 | 00000 |
| 9 | 9" | Plain | 26 | 0000000 | 00000 | __ | 000000 | 00 |
| 10 | 10" | Plain | 26 | 0000000 | 00000 | 26 | 0000000 | 000000 |
| 12 | 12" | Plain | 26 | 0000000 | 00000 | 26 | 0000000 | 000000 |
Galvanized Steel | 304 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|---|
| Duct Size | Female ID | Male OD | Gauge | End Construction | Each | Each | ||
Female | ||||||||
| 3 | 3" | __ | 26 | Plain | 00000000 | 00000 | 0000000 | 000000 |
| 4 | 4" | __ | 26 | Plain | 00000000 | 0000 | 0000000 | 00000 |
| 5 | 5" | __ | 26 | Plain | 00000000 | 0000 | 000000 | 00 |
| 6 | 6" | __ | 26 | Plain | 00000000 | 0000 | 0000000 | 00000 |
| 7 | 7" | __ | 26 | Plain | 00000000 | 00000 | 000000 | 00 |
| 8 | 8" | __ | 26 | Plain | 00000000 | 00000 | 0000000 | 00000 |
| 9 | 9" | __ | 26 | Plain | 00000000 | 00000 | 000000 | 00 |
| 10 | 10" | __ | 26 | Plain | 00000000 | 00000 | 0000000 | 000000 |
| 12 | 12" | __ | 26 | Plain | 00000000 | 00000 | 000000 | 00 |
| 14 | 14" | __ | 26 | Plain | 00000000 | 00000 | 000000 | 00 |
| 16 | 16" | __ | 26 | Plain | 00000000 | 00000 | 000000 | 00 |
| 18 | 18" | __ | 26 | Plain | 00000000 | 00000 | 000000 | 00 |
| 20 | 20" | __ | 24 | Plain | 00000000 | 00000 | 000000 | 00 |
| 22 | 22" | __ | 24 | Plain | 00000000 | 00000 | 000000 | 00 |
| 24 | 24" | __ | 24 | Plain | 00000000 | 00000 | 000000 | 00 |
Male | ||||||||
| 3 | __ | 2 7/8" | 26 | Crimped | 00000000 | 0000 | 000000 | 00 |
| 4 | __ | 3 7/8" | 26 | Crimped | 00000000 | 0000 | 000000 | 00 |
| 5 | __ | 4 7/8" | 26 | Crimped | 00000000 | 0000 | 000000 | 00 |
| 6 | __ | 5 7/8" | 26 | Crimped | 00000000 | 0000 | 000000 | 00 |
| 7 | __ | 6 7/8" | 26 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 8 | __ | 7 7/8" | 26 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 9 | __ | 8 15/16" | 26 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 10 | __ | 9 7/8" | 26 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 12 | __ | 11 7/8" | 26 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 14 | __ | 13 7/8" | 26 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 16 | __ | 15 7/8" | 26 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 18 | __ | 17 7/8" | 24 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 20 | __ | 19 7/8" | 24 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 22 | __ | 21 7/8" | 24 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 24 | __ | 23 7/8" | 24 | Crimped | 00000000 | 00000 | 000000 | 00 |
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.
Galvanized Steel | 304 Stainless Steel | ||||||
|---|---|---|---|---|---|---|---|
| Duct Size | ID | Gauge | End Construction | Each | Each | ||
| 3 | 2 7/8" | 18 | Rolled | 00000000 | 000000 | 000000 | 00 |
| 3 | 3 1/16" | 22 | Rolled | 000000 | 00 | 00000000 | 000000 |
| 4 | 3 7/8" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 5 | 4 7/8" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 6 | 5 7/8" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 7 | 6 7/8" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 8 | 7 7/8" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 9 | 8 7/8" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 10 | 9 7/8" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 12 | 12" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 14 | 13 15/16" | 20 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 16 | 16" | 20 | Rolled | 00000000 | 00000 | 00000000 | 000000 |
| 18 | 17 7/8" | 20 | Rolled | 00000000 | 00000 | 000000 | 00 |
| 18 | 17 15/16" | 20 | Rolled | 000000 | 00 | 00000000 | 000000 |
| 20 | 19 7/8" | 20 | Rolled | 00000000 | 00000 | 000000 | 00 |
| 20 | 19 15/16" | 20 | Rolled | 000000 | 00 | 00000000 | 000000 |
| 22 | 21 7/8" | 20 | Rolled | 00000000 | 00000 | 000000 | 00 |
| 24 | 23 7/8" | 20 | Rolled | 00000000 | 00000 | 000000 | 00 |
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 | Male OD | Gauge | End Construction | Each | Each | ||
Male | |||||||
| 3 | 2 7/8" | 24 | Spiral | 0000000 | 000000 | 00000000 | 000000 |
| 4 | 3 7/8" | 24 | Plain | 000000 | 00 | 0000000 | 00000 |
| 4 | 3 7/8" | 24 | Spiral | 0000000 | 00000 | 000000 | 00 |
| 5 | 4 7/8" | 24 | Spiral | 0000000 | 00000 | 00000000 | 00000 |
| 6 | 5 7/8" | 24 | Plain | 000000 | 00 | 0000000 | 00000 |
| 6 | 5 7/8" | 24 | Spiral | 0000000 | 00000 | 000000 | 00 |
| 7 | 6 7/8" | 24 | Spiral | 00000000 | 00000 | 00000000 | 00000 |
| 8 | 7 7/8" | 24 | Plain | 000000 | 00 | 0000000 | 00000 |
| 8 | 7 7/8" | 24 | Spiral | 0000000 | 00000 | 000000 | 00 |
| 9 | 8 7/8" | 24 | Spiral | 00000000 | 00000 | 00000000 | 00000 |
| 10 | 9 7/8" | 24 | Plain | 000000 | 00 | 0000000 | 00000 |
| 10 | 9 7/8" | 24 | Spiral | 0000000 | 00000 | 000000 | 00 |
| 12 | 11 7/8" | 24 | Spiral | 0000000 | 00000 | 00000000 | 00000 |
| 14 | 13 7/8" | 24 | Spiral | 0000000 | 00000 | 00000000 | 000000 |
| 16 | 15 7/8" | 24 | Spiral | 0000000 | 00000 | 00000000 | 000000 |
| 18 | 17 7/8" | 22 | Spiral | 00000000 | 00000 | 000000 | 00 |
| 18 | 17 7/8" | 24 | Spiral | 000000 | 00 | 00000000 | 000000 |
| 20 | 19 7/8" | 24 | Spiral | 00000000 | 00000 | 00000000 | 000000 |
| 22 | 21 7/8" | 24 | Spiral | 00000000 | 00000 | 000000 | 00 |
| 24 | 23 7/8" | 24 | Spiral | 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.
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.
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.
Sloped Roof Vent Caps
Cover external vents to reduce downdrafts and prevent obstructions from entering the vent.
For Duct | Painted Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Ht. | Wd. | Dia. | Ht. | Wd. | Lg. | Gauge | Features | Includes | Each | |
For Rectangular and Round Duct | ||||||||||
| 10" | 3 1/4" | 8" | 6 5/8" | 14 1/4" | 18 3/4" | 24 | Bird Screen | Backdraft Damper | 0000000 | 000000 |
Wall Vent Caps
Cover external vents to reduce downdrafts and prevent obstructions from entering the vent.
For Duct | Mounting | Painted Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Ht. | Wd. | Ht. | Wd. | Lg. | Gauge | Features | Includes | Fasteners Included | Hole Dia. | Each | |
For Rectangular Duct | |||||||||||
| 10" | 3 1/4" | 5 5/8" | 12 3/4" | 8 7/8" | 24 | Bird Screen | Backdraft Damper | No | 3/16" | 0000000 | 000000 |
Expansion Plugs for Conduit
Seal conduit openings to keep water, dirt, and animals from damaging your wiring. When you twist the nut on top of these plugs, a rubber seal expands to close off the end of your conduit. Tie a rope or pull line to the loop at either end of these plugs to hold them in place during installation.
For technical drawings and 3-D models, click on a part number.
For Conduit | Material | ||||||
|---|---|---|---|---|---|---|---|
Trade Size | ID | O'all Ht. | Seal | Loop | Features | Each | |
Loop Nut—Plastic Plate | |||||||
| 3/4 | 0.77"-1.02" | 3 1/4" | Synthetic Rubber | Plastic | Internal Eyebolt | 0000000 | 00000 |
| 1 | 0.99"-1.39" | 3 3/4" | Synthetic Rubber | Plastic | Internal Eyebolt | 0000000 | 0000 |
| 1 1/4 | 1.16"-1.51" | 3 13/16" | Synthetic Rubber | Plastic | Internal Eyebolt | 0000000 | 0000 |
| 1 1/2 | 1.46"-1.83" | 4" | Synthetic Rubber | Plastic | Internal Eyebolt | 0000000 | 0000 |
| 2 | 1.83"-2.39" | 4" | Synthetic Rubber | Plastic | Internal Eyebolt | 0000000 | 0000 |
| 2 1/2 | 2.4"-2.99" | 7 1/2" | Synthetic Rubber | Plastic | Internal Eyebolt | 0000000 | 00000 |
| 3 | 2.92"-3.45" | 7 5/8" | Synthetic Rubber | Plastic | Internal Eyebolt | 0000000 | 00000 |
| 3 1/2 | 3.41"-3.9" | 8 3/16" | Synthetic Rubber | Plastic | Internal Eyebolt | 0000000 | 00000 |
| 4 | 3.94"-4.33" | 7 1/2" | Synthetic Rubber | Plastic | Internal Eyebolt | 0000000 | 00000 |
| 5 | 4.85"-5 1/4" | 7 5/8" | Synthetic Rubber | Plastic | Internal Eyebolt | 0000000 | 00000 |
| 6 | 5.92"-6.37" | 10 5/8" | Synthetic Rubber | Plastic | Internal Eyebolt | 0000000 | 00000 |