Product Specifications:
- Constructed of 30 gauge galvanized steel
- Available in 4" through 18" diameter
- Designed for R4, R6 ductboard
- Holes pre-punched for damper
- Snap closure with double-lock
- Bead at top of collar to increase rigidity
- 5/8" flange designed for easy installation
- May be used with standard sheet metal duct or flexible duct