A casement is a hinged opener, so there is technically no such thing as a fixed casement, although it would be widely understood. The correct name is fixed light.
I would describe your setup something like:
Bay window. Left panel, single horizontal bar fixed lights. Centre panel, single horizontal bar fixed lights. Right panel, single horizontal bar, upper top hung casement, lower side hinged casement
Most importantly, I would draw a sketch, using triangles correctly to indicate the hinge positions. You should also state your preference for horizontal bars as being spacers or full bars.
Finally, besides the fact that I wouldn't consider uPVC in any case, the window you appear to have specified will look odd, being non-symetrical and, depending on the sizes of the side panels may provide inferior rapid ventilation and fire egress. You should consider openers in the main panel. Note that opening windows will look considerably different to fixed lights.
Given the spec, I would hazard a guess that it might be a Victorian or Edwardian residence (I may be wrong). If so, consider reinstating the original sash windows. The cheapest we have found for supply only is "box sash willys".
I'm in the process of doing this - I worked out that I can make the section fairly easily on a circular saw bench, with probably a fair bit of sanding.
=================== Nothing to do with terminology but....................
One detail to consider very carefully is the position of the transom. UPVC sections are usually much wider than the wooden ones they replace and this reduces the glass area. If the transom is too high the glass in the upper lights can look ridiculously small. It's worth looking at windows in other houses and in the showrooms if possible to take measurements. It would also be worth doing a scale drawing of what you want to make sure it looks right.
Its just the way the 'trade' does it. I hate it. But its most commonly spelt that way by architects and so on.
Gosh,. This American spell checker can't cope with 'spelt' either.
I couldn't believe it when listening to a very old episode of Cagney and Lacey to hear them say 'burglarize;' with a straight face. I assumed it was Noo Yawk slang, till I discovered its standard US usage..
The last time I looked it up in a dictionary, it was supposed to be spelt sill. However, it listed cill as an alternate spelling in use in the UK construction industry.
Normally, the openers have an additional frame and fixed lights do not. This means that openers look very different and you should bear this in mind when attempting to produce a symmetrical effect.
You could specify the fixed lights as effectively nailed shut casements. However, this would be almost as expensive as making them real openers. It would also seriously reduce the glazed area.
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