Fixed secondary glazing is considered to be part of our Economy system and functions in much the same way (i.e. it is a face fix system with no subframe). However, economy fixed secondary is simply an Ultra slim ‘Fixed’ frame, made from a single piece of 20mm wide profile and has no odd leg or flange for fixing through.
It is pretty much a system in its own right, designed specifically for the purpose of being used as fixed secondary glazing.
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