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Steve Price, who writes about specifying ventilation elements on pages 28-31, is the managing director of Price Technical, a supplier of grilles and diffusers.

Keith Roberts, who writes this month's focus on roofing on pages 41-48, is a specialist in roofing and runs Roberts Consulting, offering design work and advice.

Keith Horsley, who has coordinated and written most of the focus on energy on pages 25-34, is an executive engineer with Hoare Lee Consulting Engineers.

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