138 Series Double Glazed Double Hung Windows

The finesse of the 138 Series is outstanding. The 75mm frame gives the bold & stately appearance sought after for today’s modern architecture – it’s defining lines adding a touch of prestige. The distinctive vertical sliding action of the 138 Series is facilitated by its unique constant force spring system – giving the smooth, easy opening operation.

The 75mm frame gives excellent scope to the wide variety of Double Glazing options.

The unique tilt sash feature is a winner with the opened sash able to be tilted inwards for maintenance and easy cleaning of external glass surfaces. This product is ideal for both prestigious & double-story residential applications.

Tried and tested design methods in conjunction with quality hardware combine to provide a window with exceptional structural and operational performance.

All Westal Double-Hung Windows incorporate fully sealed corner joints (frame) and full perimeter weatherproofing (sashes).


  • ‘Constant Force Spring’ opening operation
  • 75mm Frame facilitating Double Glazing options.
  • Unique tilt sash operation for ease of cleaning
  • Strong interlocking rails for improved security and structural performance.
  • Excellent ventilation control
  • Full width lifting rail for easy operation
  • Non-corrosive, low maintenance hardware components including a die cast cam-action sash lock.  Keyed sash lock option also available
  • Fly, barrier and Crimsafe screening options


For further information, select from the following:

138 Series Double Hung Window.pdf
138 Series Configurations & Standard Sizes.pdf
Westal Colour Selector.pdf
Screen Options

For further information regarding security, acoustic and energy efficiency options... Contact Us

Opening & Closing

  • Closed
  • Open
  • Tilted

Double Hung Gallery

Specification Diagram