WeatherLok Model 311

Also available with side lites, transoms and specialty shapes.

Standard Features

  • 7/8" insulated Warm-Edge Sealant System with tempered glass
  • All-welded frame and panel pre-assembled for easy installation
  • Reversible panel design allows for moving panel to be located on left or right side
  • Integrated nailing fin
  • Aluminum track for moving panel
  • Sliding panel and meeting rail reinforced with roll-formed steel to ensure rigidity and strength
  • Screen optional
  • Interlocking panel virtually eliminates air infiltration
  • White enamel handle


  • Low-E and Low-E with Argon
  • Ultra Low-E with Argon Gas (May be required for Energy Star rating)
  • 5/8" or 3/4" Flat and 5/8" or 1" Contoured grid


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