Fusible nut melts at the temperature of 158 degrees F, allowing spring to hit operating arm, which closes louvers of register.
*sizes are measured in inches
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| MODEL # | METAL | OPENING | NO. PER CARTON |
| 06x06KREG | White Powder Coated | 06×06 | 1 |
| 06x06KREG With Fan | White Powder Coated | 06×06 | 1 |
| 08x08KREG | White Powder Coated | 08×08 | 1 |
| 08x08KREG With Fan | White Powder Coated | 08×08 | 1 |