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Duct Fire Dampers
In case of a fire, these dampers shut automatically to stop airflow. They have a fusible link that melts at 165° F, releasing a spring to close the blade. Dampers meet UL 555 fire safety standards to help prevent the spread of fire for 11/2 hours. They are undersized to fit inside duct.
For Round Duct
 |
Galvanized Steel—Strong and corrosion resistant, galvanized steel is the most commonly used ductwork material.
Overall | Galvanized Steel | ||||||||
|---|---|---|---|---|---|---|---|---|---|
Duct Size | OD | Ht. | Wd. | Fire Safety Std. | Fusible Link Melting Temp., ° F | Ga. | Each | ||
| 4 | 3 3/4" | 6 3/4" | 6 3/4" | UL 555 | 165 | 22 | 00000000 | 0000000 | |
| 6 | 5 3/4" | 8 3/4" | 8 3/4" | UL 555 | 165 | 22 | 00000000 | 000000 | |
| 8 | 7 3/4" | 10 3/4" | 10 3/4" | UL 555 | 165 | 22 | 00000000 | 000000 | |
| 10 | 9 3/4" | 12 3/4" | 12 3/4" | UL 555 | 165 | 22 | 00000000 | 000000 | |
| 12 | 11 3/4" | 14 3/4" | 14 3/4" | UL 555 | 165 | 22 | 00000000 | 000000 | |
For Square Duct
 |
Galvanized Steel—Strong and corrosion resistant, galvanized steel is the most commonly used ductwork material.
For Duct | Overall | Galvanized Steel | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Ht. | Wd. | Ht. | Wd. | Dp. | Fire Safety Std. | Fusible Link Melting Temp., ° F | Ga. | Each | ||
| 8" | 8" | 7 3/4" | 7 3/4" | 4 7/8" | UL 555 | 165 | 22 | 0000000 | 000000 | |
| 12" | 12" | 11 3/4" | 11 3/4" | 4 7/8" | UL 555 | 165 | 22 | 0000000 | 00000 | |
| 14" | 14" | 13 3/4" | 13 3/4" | 4 7/8" | UL 555 | 165 | 22 | 0000000 | 00000 | |
| 18" | 18" | 17 3/4" | 17 3/4" | 4 7/8" | UL 555 | 165 | 22 | 0000000 | 000000 | |
| 24" | 24" | 23 3/4" | 23 3/4" | 4 7/8" | UL 555 | 165 | 22 | 0000000 | 000000 | |
