Dessian manufactures the REHAU 703 Tritec (60mm) system and REHAU TOTAL70 (70mm) uPVC window and door systems. We have developed our product range over the last 29 years and always strive to provide frames that offer both efficiency and aesthetic appeal, backed up by excellent customer service. Please contact us for more information.


Vertical Sliders

Vertical Sliders are extremely popular for replicating the character of traditional sash windows, but with all the advantages of modern PVCu windows.


REHAU Heritage 2 Vertical Sliders
  • Top and bottom vertical sliding sashes for a range of opening options
  • Both sashes tilt in for ease of cleaning
  • Caldwell-made pre-tensioned spirals (Ultralift) with a double spring and spirals (torso) on larger windows (tested to exceed 20,000 cycles)
  • Internal profiles of 43mm to give an authentic timber appearance
  • Authorised for use in conservation areas
  • Available with Georgian bar or astrigal bar
  • Deep bottom rail for authentic original sash appearance
  • Optional tilt open facility to both sashes for ease of cleaning
  • Reverse tilt system that can facilitate fire egress down to 1082mm high 


Spectus Vertical Slider
  • Available in White, Cream, Oak, Mahogany and Rosewood
  • Top and bottom sliding sashes
  • Both sashes tilt inwards for ease of cleaning
  • Optimal deep bottom rail
  • Available with Georgian bar or Astrigal bar
  • Supplied glazed


View Colour Options