Precision, Speed and Accuracy

The Glass Master SG-220 Grooving Machine fabricates quality fiberglass duct systems 15 to 20 times faster than standard hand grooving techniques. Powered by a heavy-duty electric motor, multiple upper and lower drive rollers quickly pass the duct board through precision-ground, hardened blades producing consistent contours and duct dimensions. Staple flap blades remove fiberglass scrap from the facing, eliminating the need for subsequent cleaning operations. The SG-220 is easily adaptable to groove 1", 1-1/2" and 2" board.

Positioning tools for different duct sizes is easy and accurate on the SG-220. Built-in spacer tabs simplify tool set-up using only inside duct dimensions. Quick-release clamps allow for rapid positioning of the tools. The SG-220 sets up easily for 1-, 2- and 4-piece duct construction methods. An easy-to-read decal clearly illustrates proper tool settings for various fabrication methods.


Standard Features

  • Rugged structural steel construction
  • Durable powder coat finish
  • Foot-actuated switch for safe, dependable operation
  • Easy access to all working parts
  • Swivel casters, two with brakes


Ready to place an order, or have a comment or question about our products? Contact us.

Technical Information

Technical Info

  • Power requirements: 120V, single phase, 50hz or 60hz. Less than 15 amps required at maximum load.
  • Board feed rate: one linear foot per second (0.3 m/s)


  • Length: 130"
  • Depth: 31"
  • Height: 47"
  • Weight: 1,200 lbs

Optional Accessories

  • Tool sets with blades for 1", 1-1/2" and 2" board
  • Board support arms (set of 3)
  • Catch table
  • Tool support bar


See the Tools and Accessories page for a complete list of available accessories, tool holders and blades.