This Master Flow accessory is used in conjunction with a Register Boot to allow the installer to pre-hang a boot during construction rough out. It can be nailed or screwed to ceiling joists to install. Use with a Universal, Straight, 90° or End Boot w/ a 4 in. x 10 in. opening size.
- 30-Gauge galvanized steel
- Lip on product provides clean edge for drywall installation
- Can be taped or screwed to 4 in. x 10 in. side of register boot
- 24 in. L to span typical ceiling joists








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