damper opens with screwdriver
| duct opening | without damper | with metal damper |
| 2.25 by 10 inches | $43.95 | not available |
| 2.25 by 12 inches | $43.95 | not available |
| 2.25 by 14 inches | $49.95 | not available |
| 4 by 8 inches | $48.95 | not available |
| 4 by 10 inches | $58.95 | $108.95 |
| 4 by 12 inches | $59.95 | $118.95 |
| 4 by 14 inches | $60.95 | not available |
| 6 by 6 inches | $58.95 | not available |
| 6 by 10 inches | $63.95 | $128.95 |
| 6 by 12 inches | $69.95 | $148.95 |
| 6 by 14 inches | $74.95 | not available |
| 8 by 10 inches | $88.95 | $158.95 |
| optional: mounting holes and screws: add $8.95 |