What size opening is required for a Flat Roof Window?

When installing a FAKRO flat roof window the structural opening should be made the same size as the nominal size of the window purchased ( for example: window DXF 60 x 60cm will require an actual opening in the roof of 60 x 60cm.

If the opening in your roof is slightly bigger – do not worry, there is a 5cm tolerance on both dimensions.

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