Size guide for Clearview secondary glazing

These tables give an overview of recommended minimum and maximum secondary glazed unit sizes for our Vision and Vision Ultra ranges. For detailed information, including glazing for larger than recommended sizes, refer to our minimum and maximum size guide download.

See the specific product page, in the products dropdown menu, or email details of your query. You’ll find the glass weight calculation formula here.

If your window is larger than the recommended sizes in the Classic table, consider combining units or the Forte range, created for larger windows.

Download Our Minimum and Maximum Suggested Unit Sizes

If you need any more assistance, email us with sizes of the required unit.


* Classic Maximum Panel Panel Weights: Horizontal Sliders 40kgs / Vertical Sliders 25kgs / Hinged Unit 35kgs.

* Forte Maximum panel weights: Horizontal Sliders 60kgs / Vertical Slider 48kgs / Hinged Units 130kgs.

Maximum width is determined by panel weight and height, it may not be possible to make some units in the maximum width specified and will need to clarified at point of enquiry.

  1. Calculate glass weight and do not exceed the maximum panel weight.
  2. Maximum area for 4mm glass is 1.6m2. If panel size exceeds this, allow for 6mm toughened glass. Maximum area for 6mm glass is 3.0m2. If panel size exceeds this, allow for 6.4mm laminated glass.
  3. Flyscreens: maximum size 1200mm in one direction

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