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Chamfered Sash
A:
 Well firstly, both are multi-chambered. This means there are three individual pockets inside the sections.
This enables the galvanised steel reinforcement to be sealed in its own department, well away from the separate drainage channel which allows water to clear away easily.
Secondly, three chambers are better at insulation than two.
That’s how our company was the first to achieve an eco friendly, energy efficiency "green" rating. 4.16.4 units generally provide U values better than 1.8 however our classic windows achieved the new D energy rating using low Iron glass. Please ask for further details.
Most importantly however, when extruding companies compete for market position, introducing new products (to tempt manufacturers and homeowners alike), they often do so at the cost of authenticity... that’s why the we have our own sash profiles designed to recreate the "putty line" that virtually all sash windows had originally.
However, if an Ovolo detail is required externally on the sash, that’s also available. Internally most beading and bars were Ovolo in shape... that’s exactly what you get with our windows.
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