No doubt the requirement is for a Fire Resistance Level (FRL) expressed as -/60/- where the 60 refers to the 'integrity' of the window, meaning the ability to resist the passage of flames for 60 minutes. It commonly applies to windows on a boundary. A standard timber window with standard glass would not be able to achieve this rating. However, you will find certified timber windows on the net if you write '60 min fire resistant timber windows' or similar wording in your browser.Fire resistant windows
Answered on 24-10-2020
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