Corporate W20 Series

The Crittall 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 .55 inches when gasket glazed, and .63 inches wet glazed ensures excellent thermal insulation properties, while 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 .63 inches
  • Aesthetically delivers very slim sightlines thus maximizing the glazing
  • Hot-dip galvanized
  • Factory-applied Duralife polyester powder coat finish
  • Integral EPDM weather-stripping
  • Landmark Approved
  • Ideal for Replica Refurbishment and new design


Materials and Finishes

All Crittall windows and doors are hot-dip galvanized to ASTM A 123 (BS EN ISO 1461:1999). The units are entirely immersed in molten zinc resulting in windows and doors that are completely protected against corrosion.

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.

Colors Available

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

  1. 1. Standard hand operated folding opener.
  2. 2. Standard spring catch.
  3. 3. Standard peg stay.
  4. 4. Friction restrictor stay.
  5. 5. Concealed bolt.
  6. 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


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 50 1200*
Horizontal Pivot 1200 300 100 1200*
Bottom Hung 1200 300 100 1200*
Side Hung Open In 1200 300 100 1200*
Side Hung Open Out 2000 300 300 2000
Top Hung 2000 300 300 2000

*A higher wind resistance can be achieved.