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Corporate w20 Series

The Corporate W20 windows and doors range offers great versatility. No other steel window system offers such an extensive range of sections, allowing the designer the opportunity to create many styles including elaborate composite windows.

An effective weather-stripping system, and the option of double glazing up to 14mm when gasket glazed, and 16mm wet glazed ensure excellent thermal insulation properties, and the system's large opening casements and slim frame make it particularly popular with conservationists and planners.


  • Offers flexibility in design via shaped windows and has the ability to form extensive composite windows.
  • Glazing up to 16mm.
  • Aesthetically delivers very slim sightlines thus maximizing the glazing.
  • Hot-dip galvanized.
  • Factory-applied Duralife polyester powder coat finish.
  • Integral EPDM weather-stripping.
  • English Heritage Approved.
  • Ideal for Replica Refurbishment.

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To learn more about Steel Windows & Doors and our entire product line, please contact us directly.

Materials and Finishes

All Crittall windows and doors are hot-dip galvanized after manufacture to ASTM A 123 (BS EN ISO 1461:1999). Because they are entirely immersed in molten zinc, the windows and doors are completely protected against corrosion.

  • Crittall Galvanzied

    Hot Dipped Galvanized Steel

    The hot- dip galvanizing process provides corrosion protection to mild steel components by coating and chemically bonding pure zinc to the steel substrate. To learn more about

    Learn More

  • Ral Colors

    Colors Available

    Crittall products are powder coated and then painted in a wide range of available colors. Click the link to the right to see all of the color options available.

    Learn More


  1. Standard hand operated folding opener.
  2. Standard spring catch.
  3. Standard peg stay.
  4. Friction friction restricting stay.
  5. Concealed bolt.
  6. Standard side arm.



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

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


One hour fire resistance integrity to BS 476: Part 22: 1987 can be achieved with specially prepared fixed lights and doors, constructed and glazed in conformity with the specification of a fire screen and door unit tested at Warrington Research Centre.

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

*A higher wind resistance can be achieved.

Related Documents

Word Corporate W20 NBS (55 KB) Click here to download

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