Ductwork - Register Boxes

Register Boxes

Product availability is subject to change without notice. Not all products are available from all facilities.

Universal Straight Register Boxes

Register Boxes - Straight

Master Flow's Straight Register Box is designed to transition from round pipe or Insulated Flexible Duct to an air register. It is made of galvanized steel and installs with sheet-metal screws.

  • Galvanized steel construction
  • Creates a straight, in-line transition from an insulated flexible duct or round pipe to an air register or grille
  • Seal & Insulate ductwork for system efficiency and comfort



90 Degree Register Boxes

Register Boxes - 90 Degree

The 90-Degree Register Box creates a right angle (90-degree) transition from round pipe or insulated flexible duct to an air register or grille. It is made of galvanized steel to provide strength and durability. It can be installed with sheet-metal screws.

  • Made of galvanized steel for strength and durability
  • Create a center-end transition from the system run to an air register
  • Ideal for situations where the opening in the floor runs parallel to the floor joists
  • Seal & Insulate ductwork for system efficiency and comfort



End Register Boxes

Register Box - End

Master Flow's End Register Box is ideal when the opening in your floor is parallel to the floor joists and you need to create a center-end transition for your register.

  • Made of galvanized steel for strength and durability
  • Creates a center-end transition from the system run to an air register
  • Ideal for situations where the opening in the floor runs parallel to to the floor joists
  • Seal & Insulate ductwork for system efficiency and comfort



Ceiling Register Boxes

Ceiling Register Box

Ceiling Register Boxes are designed for a transition from round pipe or insulated flexible duct to an air register or ceiling grille. It can be installed with sheet metal screws.

  • Made of galvanized steel for strength and durability
  • Designed for a transition from round pipe or insulated flexible duct to an air register or ceiling grille
  • Seal & Insulate ductwork for system efficiency and comfort



Insulated Register Boxes

Insulated Register Box

Master Flow's Insulated Register Box is designed to transition from round pipe or flexible duct to air register or grille. It is insulated on the inside as well to help minimize condensation and better control noise.

  • Insulated...no need to wrap. Insulation serves and noise deadener and helps control condensation
  • Fiberglass insulation inside metal box



Register Box Saddles

Register Box Saddle

The Register Box Saddle allows you to cut and opening of appropriate size in the pipe branch line and secures the saddle over the hole. Insulated ductwork for system efficiency and comfort.

  • Creates horizontal transition from round pipe to an air register or grille
  • Designed to fit over a section of round pipe while securing the saddle over the hole
  • Easily cuts down in height if necessary



Ductboard Insulated Register Boxes

Ductboard Insulated Register Box

Duct Board Insulated Register Boxes are used to connect round pipe or insulated flexible duct to an air register or grille in the ceiling. They are pre-insulated with R6 Ductboard that will help provide thermal efficiency, control condensation and absorb system noise. This box can be fitted with multiple collar sizes.

  • Use to connect round pipe or insulated flexible duct to an air register or grille
  • Insulation lining helps absorb system noise and helps control condensation
  • R6 fiberglass insulation helps provide higher thermal efficiency



Snap On Rails for register box

Snap-On Rails

Rails were developed to help easily install flanged register boxes including Ductboard Register Boxes and Insulated Register Boxes. They easily attach flanged register boxes to joists or other nailing surfaces. Six rails in a pack can connect up to three register boxes.

  • 24in. length makes it easy to suspend boot between joists
  • Also make great duct hangers
  • Bag of six can connect three register boxes



Universal Straight Register Boxes with Flange

Register Box w/ Flange

The Master Flow Register Box with Flange creates a straight (in-line) transition from round pipe or insulated flexible duct to an air register or grille. The built-in flange provides a drywall lip for rough-in installation and a way to connect snap-on rails for connection to a joist.

  • Made of galvanized steel for strength and durability
  • Creates a straight (in-line) transition from round pipe or insulated flexible duct to an air register or grille
  • Built-in flange provides area for register screws, Sheetrock frame or joist attachment
  • Flange allows for installation before dry walling


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