Spectus vertical sliders combine period style and traditional technique with modern technology. Period details include milled Georgian bar for a perfect fit and sash horns that are part of the sash. Frames and sashes can be mechanically jointed giving the authentic appearance of a traditional timber window and avoiding the mitred weld of UPVC.

At a Glance

  • 128mm outer frame
  • Compliant with all Building Regulations
  • 10-year guarantee


  • Authentic ovolo styling
  • Glazed internally
  • Tilt inwards facility to both sashes
  • Reliable spiral balance mechanisms for easy operation

Thermal Performance

  • WER to Band A
  • U-value to 1.4W/m2K
  • Standard 24mm double glazing
  • Thermal inserts using recycled composite materials


  • Mechanically jointed outer frame and sashes
  • 28 colour options available
  • Deep bottom rail
  • Run through or moulded sash horns
  • Weather bar
  • Travel stops for child safety


Our vertical sliders are manufactured to the highest standard. Pre-machined parts and easy fit components ensure a perfect finish and faultless fitting every time.


It is well known that historically planning authorities have not been keen on the use of PVC.

Spectus have developed a market leading UPVC sliding sash window approved by planning authorities by replicating the traditional looks with perfect detailing and enhancing window performance.

Our sliders can be mechanically jointed giving the appearance of timber frames. Period colours and the option of foiled finishes provide authentic detail alongside the durability, energy efficiency and security.