The W30 range of steel windows is a slimline derivative of the W20 range suitable for double glazed domestic and light to medium-duty commercial applications. It incorporates double weatherseals plus fully drained and ventilated glazing and with its ability to house 18mm sealed units, whilst offering very narrow sightlines on opening windows, allows W30 to attain an exceptional grade "B" window energy rating under the BFRC's (British Fenestration Ratings Council) rating scheme.
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