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 window and door problems and repairs, general advice for all makes and types.
Tip on cleaning silver aluminium: use 'Solvol Autosol' aluminium polish, from motor accessory shops.
Tip on repairing damaged white aluminium: I use 'Humbrol' white as a touch-up paint, it's just right.