About Master Flow™ Snap‑on Rails
Rails were developed for ease of installation. They are an easy way to attach flanged register boxes to joists or other nailing surfaces. A pack of 6 rails can install 3 register boxes.
Features & Benefits
COST EFFECTIVEBag of six can connect three register boxes
VERSATILEAlso make great duct hangers
EASY24-in. length makes it easy to suspend boot between joists