DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense AcquisitionRegulations Supplement)  |
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About Duct Connections
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Fire-Rated Airflow Dampers
In the event of a fire, these dampers automatically stop airflow through duct. They have a fusible link that melts at 165° F, releasing a spring and causing the blades to close. Dampers meet UL 555 fire safety standards to help prevent the spread of fire for 1 ½ hours. They are undersized to fit inside duct.
For technical drawings and 3-D models, click on a part number.
For Round Duct
For Round Duct
Overall | Galvanized Steel | |||||||
|---|---|---|---|---|---|---|---|---|
| Duct Size | OD | Gender | Ht. | Wd. | Gauge | Connection Type | Each | |
| 4 | 3 3/4" | Male | 6 3/4" | 6 3/4" | 22 | Press Fit | 00000000 | 0000000 |
| 6 | 5 3/4" | Male | 8 3/4" | 8 3/4" | 22 | Press Fit | 00000000 | 000000 |
| 8 | 7 3/4" | Male | 10 3/4" | 10 3/4" | 22 | Press Fit | 00000000 | 000000 |
| 10 | 9 3/4" | Male | 12 3/4" | 12 3/4" | 22 | Press Fit | 00000000 | 000000 |
| 12 | 11 3/4" | Male | 14 3/4" | 14 3/4" | 22 | Press Fit | 00000000 | 000000 |
For Square Duct
For Square Duct
For Duct | Overall | Galvanized Steel | ||||||
|---|---|---|---|---|---|---|---|---|
| Ht. | Wd. | Ht. | Wd. | Dp. | Gauge | Connection Type | Each | |
| 8" | 8" | 7 3/4" | 7 3/4" | 4 7/8" | 22 | Press Fit | 0000000 | 000000 |
| 12" | 12" | 11 3/4" | 11 3/4" | 4 7/8" | 22 | Press Fit | 0000000 | 00000 |
| 14" | 14" | 13 3/4" | 13 3/4" | 4 7/8" | 22 | Press Fit | 0000000 | 00000 |
| 18" | 18" | 17 3/4" | 17 3/4" | 4 7/8" | 22 | Press Fit | 0000000 | 000000 |
| 24" | 24" | 23 3/4" | 23 3/4" | 4 7/8" | 22 | Press Fit | 0000000 | 000000 |