6 by 10 cast iron
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| duct opening | without damper | with metal damper |
| 2.25 by 10 inches | $28.95 | not available |
| 2.25 by 12 inches | $29.95 | not available |
| 2.25 by 14 inches | $31.95 | not available |
| 4 by 8 inches | $29.95 | not available |
| 4 by 10 inches | $37.95 | $88.95 |
| 4 by 12 inches | $38.95 | $98.95 |
| 4 by 14 inches | $39.95 | not available |
| 6 by 6 inches | $37.95 | not available |
| 6 by 10 inches | $43.95 | $98.95 |
| 6 by 12 inches | $49.95 | $129.95 |
| 6 by 14 inches | $54.95 | not available |
| 8 by 10 inches | $76.95 | $131.95 |
| optional: mounting holes and screws: add $7.95 |