FAQ: The abbreviation FENSA stands for FENESTRATION - SELF ASSESSMENT.
The uk dictionary definition of the word fenestral or fenestrate is " belonging to or like a window" The word fenestration is "the arrangement of windows in a building". FENSA is used by double glazing uk trade companies to certify that their replacement windows and doors installed comply with Building Regulations Document L (and more), actually checking av. 1% of all replacement windows installations.
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Double glazing in the UK - buying, help & advice.
If you are OUTSIDE of South East Essex and want to ask about double glazing buying, or problems and want advice then this is for you: question and answers as most problems and queries for advice get very good results at my double glazing trade discussion forum pages.
The q&a lists are informative, fun, and very helpful on all double glazing installation problems and repairs, condensation, and all other d/g matters.