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  Corporate W20 Series  

The classic hot rolled steel sections. Crittall Windows Ltd.
The Corporate W20 range of windows and doors offers great versatility. No other steel window system offers its range of sections, from size and shape, to joining, to form elaboration composite windows. Corporate W20's minimal sightlines ensure maximum daylight and make it particularly popular with preservationists.
Features
  • Custom and historic shapes
  • Hot-dip galvanized
  • Factory applied Duralife epoxy-free polyester powder coat finish
  • Integral EPDM weatherstripping
  • Glazing up to 5/8"
  • Delivery 12-14 weeks from shop drawing approval
  • Full warranty on product and finish
Acoustic Properties

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 window and cavity of 200mm 35 - 40

Fire Resistance
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.
Specifications & Downloads
Charts and tables:
Specification Sheet:
Drawings: