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Corporate W20 Prison

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Traditional Prison Windows

Prison Windows

The original Crittall steel window is manufactured from Corporate W20 section. However, Crittall also offer an alternative product manufactured from Corporate 2000 (Patented design and Home Office Approved).

Typically a prison window is:

  • Approximately a metre square.
  • Divided into five vertical panels, each 125mm wide.
  • The outer two lights can be opened from the inside, restricted to a 35 degree opening.
  • The frame arrangements elevationally mirror the 24 hour grille pattern and offer a flush relationship.
  • Fitted with shortened grip prison handle with shake proof screw and flat washer concealed by a stainless steel shroud. 

Improved Special Cell Prison Windows

An alternative prison window design to aid the safe cell concept.

  • The window offers ventilation and daylight and reduces the ligature risk.
  • Designed to resist being damaged or tampered with. 

Acoustic Properties

Sound insulation of weather stripped windows/doors (approximate values averaged over a frequencyrange of 100 to 3150Hz).

Acoustic Properties
 Type of Glass  Sound Insulation (dB)
 Single Glass  20 - 28
 Double Glass  28 - 30
 Secondary windows and cavity of 200mm  35 - 40

Steel Performance
Type of opening light Exposure Catagory (Pa) Air Permeability: Not more than 16m3/h/m joint, at (Pa) Water Tightness: No leakage, at (Pa) Wind Resistance: No damage and only permissable deflection, at (Pa)
Vertical Pivot  1200  50  300  1200*
Horizontal Hung  1200  100  300  1200*
Bottom Hung  1200  100  300  1200*
Side Hung Open In  1200  100  200  1200*
Side Hung Open Out  2000  300  200  2000
Top Hung  2000  300  200  2000

*A higher wind resistance can be achieved.

Related Documents
[icon] - Adobe PDF Corporate W20 Prison NBS (6 KB) Click here to download
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Window products bearing the trademark or tradename "Hope's" which are manufactured or sold by Crittall Windows Ltd. are not available in the United States or Canada

Company registration number: 200794

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