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The increased opening size found on our fire escape uPVC sliding sash windows is based on an overall % of the total window size. However, as a general rule the height should be around 450mm. For more information about fire escape options, speak to our product experts or read through the section on fire safety in our building regulations guide.
Please note, our news articles are relevant and accurate at the time of release, but as technical developments dictate, and times goes by the information in this article may no longer be applicable. If you have questions, please contact us using our online contact form or call us on 03332 412 240.