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.
For technical drawings and 3-D models, click on a part number.
Airflow dampers control airflow through duct. Gasketed dampers are airtight.
Galvanized Steel | |||||||
|---|---|---|---|---|---|---|---|
| Duct Size | Male OD | Gauge | Gasket Material | End Construction | Blade Material | Each | |
Standard | |||||||
| 4 | 3 3/4" | 20 | __ | Plain | Galvanized Steel | 00000000 | 000000 |
| 5 | 4 3/4" | 20 | __ | Plain | Galvanized Steel | 00000000 | 00000 |
| 6 | 5 3/4" | 20 | __ | Plain | Galvanized Steel | 00000000 | 00000 |
| 7 | 6 3/4" | 20 | __ | Plain | Galvanized Steel | 00000000 | 00000 |
| 8 | 7 3/4" | 20 | __ | Plain | Galvanized Steel | 00000000 | 000000 |
| 9 | 8 3/4" | 20 | __ | Plain | Galvanized Steel | 00000000 | 000000 |
| 10 | 9 3/4" | 20 | __ | Plain | Galvanized Steel | 00000000 | 000000 |
| 12 | 11 3/4" | 20 | __ | Plain | Galvanized Steel | 00000000 | 000000 |
| 14 | 13 3/4" | 20 | __ | Plain | Galvanized Steel | 00000000 | 000000 |
| 16 | 15 3/4" | 20 | __ | Plain | Galvanized Steel | 00000000 | 000000 |
| 18 | 17 3/4" | 20 | __ | Plain | Galvanized Steel | 00000000 | 000000 |
| 20 | 19 3/4" | 18 | __ | Plain | Galvanized Steel | 00000000 | 000000 |
| 22 | 21 3/4" | 18 | __ | Plain | Galvanized Steel | 00000000 | 000000 |
| 24 | 23 3/4" | 18 | __ | Plain | Galvanized Steel | 00000000 | 000000 |
Gasketed | |||||||
| 4 | 3 7/8" | 20 | Neoprene Rubber | Plain | Galvanized Steel | 0000000 | 000000 |
| 6 | 5 7/8" | 20 | Neoprene Rubber | Plain | Galvanized Steel | 0000000 | 000000 |
| 8 | 7 7/8" | 20 | Neoprene Rubber | Plain | Galvanized Steel | 0000000 | 000000 |
| 10 | 9 7/8" | 20 | Neoprene Rubber | Plain | Galvanized Steel | 0000000 | 000000 |
| 12 | 11 7/8" | 20 | Neoprene Rubber | Plain | Galvanized Steel | 0000000 | 000000 |
Galvanized Steel | Aluminum | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Duct Size | Female ID | 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 |
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.
Collars create branches from a rectangular duct. Cut a hole in the duct and use a collar to attach spiral duct.
Galvanized Steel | ||||||
|---|---|---|---|---|---|---|
| Duct Size | Male OD | Gauge | Gasket Material | End Construction | Each | |
Collar with Damper | ||||||
| 4 | 3 7/8" | 24 | Polyethylene Foam | Plain | 00000000 | 000000 |
| 5 | 4 7/8" | 24 | Polyethylene Foam | Plain | 00000000 | 00000 |
| 6 | 5 7/8" | 24 | Polyethylene Foam | Plain | 00000000 | 00000 |
| 7 | 6 7/8" | 24 | Polyethylene Foam | Plain | 00000000 | 00000 |
| 8 | 7 7/8" | 24 | Polyethylene Foam | Plain | 00000000 | 00000 |
| 9 | 8 7/8" | 24 | Polyethylene Foam | Plain | 00000000 | 00000 |
| 10 | 9 7/8" | 24 | Polyethylene Foam | Plain | 00000000 | 00000 |
| 12 | 11 7/8" | 24 | Polyethylene Foam | Plain | 00000000 | 00000 |
| 14 | 13 7/8" | 24 | Polyethylene Foam | Plain | 00000000 | 00000 |
| 16 | 15 7/8" | 24 | Polyethylene Foam | Plain | 00000000 | 00000 |
| 18 | 17 7/8" | 24 | Polyethylene Foam | Plain | 00000000 | 00000 |
| 20 | 19 7/8" | 24 | Polyethylene Foam | Plain | 00000000 | 00000 |
| 22 | 21 7/8" | 24 | Polyethylene Foam | Plain | 00000000 | 000000 |
| 24 | 23 7/8" | 24 | Polyethylene Foam | Plain | 00000000 | 000000 |
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.
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 |
| 8 | 8" | 7 7/8" | 12 1/4" | 10" | 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 |
Furnace Draft Dampers
Also known as barometric dampers, these dampers improve furnace performance by automatically opening and closing to maintain a consistent airflow despite changing environmental conditions.
Single-acting dampers open inward to prevent strong drafts from pulling too much heat into the chimney vent.
Double-acting dampers open both inward and outward to relieve pressure caused by obstructions and downdrafts.
Steel | ||||||
|---|---|---|---|---|---|---|
| Draft Damper Type | For Duct Trade Size | Gauge | For System Type | Connection Type | Each | |
| Single Acting | 5, 6, 7 | 26 | Coal, Oil | Press Fit | 0000000 | 0000000 |
| Single Acting | 7, 8, 9 | 24 | Coal, Oil | Press Fit | 0000000 | 000000 |
| Double Acting | 5, 6 | 26 | Natural Gas, Propane | Press Fit | 0000000 | 000000 |
| Double Acting | 7, 8 | 26 | Natural Gas, Propane | Press Fit | 0000000 | 000000 |
| Single Acting, Double Acting | 9, 10 | 24 | Coal, Natural Gas, Oil, Propane | Press Fit | 0000000 | 000000 |
| Single Acting, Double Acting | 11, 12 | 24 | Coal, Natural Gas, Oil, Propane | Press Fit | 0000000 | 000000 |