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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.
304 stainless steel is more corrosion resistant than steel and aluminum.
Straight Reducers, Female × Male
Reducers connect duct with different diameters.
Duct Size | 304 Stainless Steel | ||||||
|---|---|---|---|---|---|---|---|
| (A) | (B) | Female ID (A) | Male OD (B) | End Construction | Gauge | Each | |
| 4 | 3 | 4" | 2 7/8" | Crimped | 26 | 0000000 | 000000 |
| 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 |
| 12 | 8 | 12" | 7 7/8" | Plain | 24 | 00000000 | 000000 |
| 14 | 10 | 14" | 9 7/8" | Plain | 24 | 00000000 | 000000 |
| 16 | 12 | 16" | 11 7/8" | Plain | 24 | 00000000 | 000000 |
| 18 | 14 | 18" | 13 7/8" | Plain | 24 | 00000000 | 000000 |
| 20 | 16 | 20" | 15 7/8" | Plain | 24 | 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.
304 stainless steel is more corrosion resistant than steel.
Straight Reducers
Reducers connect duct with different diameters.
Duct Size | Male OD | 304 Stainless Steel | |||||
|---|---|---|---|---|---|---|---|
| (A) | (B) | (A) | (B) | End Construction | Gauge | Each | |
| 4 | 3 | 3 7/8" | 2 7/8" | Plain | 24 | 00000000 | 000000 |
| 5 | 4 | 4 7/8" | 3 7/8" | Plain | 24 | 00000000 | 00000 |
| 6 | 4 | 5 7/8" | 3 7/8" | Plain | 20 | 0000000 | 00000 |
| 6 | 5 | 5 7/8" | 4 7/8" | Plain | 24 | 00000000 | 00000 |
| 7 | 6 | 6 7/8" | 5 7/8" | Plain | 24 | 00000000 | 00000 |
| 8 | 6 | 7 7/8" | 5 7/8" | Plain | 20 | 0000000 | 000000 |
| 8 | 7 | 7 7/8" | 6 7/8" | Plain | 24 | 00000000 | 000000 |
| 9 | 8 | 8 7/8" | 7 7/8" | Plain | 24 | 00000000 | 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 |
| 12 | 10 | 11 7/8" | 9 7/8" | Plain | 24 | 00000000 | 000000 |
| 14 | 12 | 13 7/8" | 11 7/8" | Plain | 24 | 00000000 | 000000 |
| 16 | 14 | 15 7/8" | 13 7/8" | Plain | 24 | 00000000 | 000000 |
| 18 | 16 | 17 7/8" | 15 7/8" | Plain | 24 | 00000000 | 000000 |
| 20 | 18 | 19 7/8" | 17 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.
304 stainless steel is the most corrosion resistant.
Reducers
Reducers connect duct with different diameters.
Duct Size | ID | 304 Stainless Steel | |||||
|---|---|---|---|---|---|---|---|
| (A) | (B) | (A) | (B) | Gauge | End Construction | Each | |
| 4 | 3 | 3 7/8" | 3 1/16" | 22 | Rolled | 00000000 | 0000000 |
| 5 | 4 | 4 7/8" | 3 7/8" | 22 | Rolled | 00000000 | 000000 |
| 6 | 4 | 5 7/8" | 3 7/8" | 22 | Rolled | 00000000 | 000000 |
| 6 | 5 | 5 7/8" | 4 7/8" | 22 | Rolled | 00000000 | 000000 |
| 8 | 6 | 7 7/8" | 5 7/8" | 22 | Rolled | 00000000 | 000000 |
| 10 | 6 | 9 7/8" | 5 7/8" | 22 | Rolled | 0000000 | 000000 |
| 10 | 8 | 9 7/8" | 7 7/8" | 22 | Rolled | 00000000 | 000000 |
| 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 |