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I have the 1970's narrow gap 4-6-4 mm units. (6 is the gap in mm) A few have "gone" over the years and I have replaced them with units made up by The Glass Company on Canvey Island (01268 696688). Not the cheapest but they seem to know their business.
Certainly for narrow gaps I would recommend Guardian coated glass, it improves the narrow gap performance by about half as much again in theory.
Harry
Originally posted by harryhound
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Sounds expensive at 90 GBP per unit, however big that is. Where ever you are in the country, you could 'phone these people in Canvey and ask their clerk "how much per sq meter for an order ..........". When I replaced mine, this producer was NOT the cheapest but their customer service/experience seemed to be better. I started using them by removing an opening lite and taking it in saying "make me a unit for that". Now I have done most of the rest of the house with the more expensive coated glass I am pleased. Though the outside temperature today is 2 degrees and frosty, the condensation is still not running down the inside, though it is misting round the edges. I used to waste 1/2 an hour a day drying windows when I had single glazing.
By the way, best practice is to mount these units on narrow plastic strips, like putting plaster board on battens to keep it off the dirty damp floor. A block/strip an inch or three in from each corner at the bottom for fixed lites. For opening casement lites it is a block/strip at the bottom in a bit from the corner nearest the hinges and the second one near the top poked in vertically to take the weight of the unit trying to fall away from the hinges. This is because the unit is stronger and heavier than the frame