Master Flow - 14 in. x 6 in. to 8 in. Universal Register Box - Creates a straight, in-line, transition from round pipe or insulated flexible duct to an air register or grille. Made of galvanized steel.

Dec 11, 2025 · FREE SHIPPING to Continental US - Wall or floor box for air register connect to round HVAC supply ductwork. Last dimension is round connection size. Sheet metal will come …

This affordable Master Flow Insulated Register Box helps to bring air into the room. Always seal seams with code approved mastic, sealant or duct tape.

Create a transition from round pipe or insulated flexible duct to an air register or grille with the selection of this Master Flow Ceiling Register Box.

Ensure super quick and easy transition from the round pipe to a register by using this fantastic Master Flow Ceiling Register Box. Highly durable product.

The Master Flow 14 in. x 14 in. to 12 in. Ceiling Register Box features a 30-gauge, galvanized-steel construction to provide strength and durability. This ceiling register box creates a …

Easily make a transition from round pipe or insulated flexible duct to a register by installing this excellent Master Flow Universal Register Box.