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Howarth Windows has joined forces with Dwell-Vent - a University of Cambridge start-up company - to bring advanced Supply Air Windows (SAW) to the UK market for the first time. The product provides passive ventilation and U-values between 0.7 and 0.9. SAW consist of two panes of glass separated by a gap through which air is drawn; unlike trickle vents that supply cold ventilation above windows, air enters at the bottom of the window to be warmed by either solar energy or heat that would otherwise escape from the house. 'Smart' vents - developed by Dwell-Vent - are fitted at the top of the window's interior, and regulate the flow of air and eliminate drafts. The frames are made from engineered laminated timber and can appear in a painted or stained finish. The windows are reversible and the panes can be opened to allow the outside and ventilation route to be cleaned easily.

Clearwood continues to integrate state-of-the-art CNC (computer numerically controlled) technology with experienced craftsmen to create products with a heritage feel that have modern production standards.

The South West-based company has launched a new Innovation range of timber casement windows, which, in January 2006, was the first product to be given the UK's highest timber window efficiency rating by the British Fenestration Rating Council. This was achieved by using frames with larger sections - 95mm depth by 70mm width - that provide better thermal insulation.

The second method was the use of double glazing filled with argon gas, incorporating Saint Gobain Futur N and Edgetech's superspacer bar, which is a foam insulator between the panes. A range of stained and painted finishes is available for the laminated timber frames.

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