VELFAC Fire elements are only available in wood/aluminium and as a triple glazed fixed light.
They are available in both 123mm and 149mm frame depths.
Should a factory fitted packer be required to carry an aluminium cill, then ONLY the 149mm frame depth can be chosen.
A 149mm frame depth is also available without the factory fitted packer.
The image below is a window section as shown by the orange box.