Respond to these showcases www. ajplus. co. uk/ajdirect Readers may obtain information about these products by filling in the enquiry numbers on an AJ enquiry card. Advertisers wishing to promote their products on these pages should contact Chris Bond on 020 75056816 Vortice is the only manufacturer of ventilation systems able to prove that its ranges of domestic and commercial fans comply with the requirements of the BS EN 13141 standards. The new regulations require an 'installed performance' and demand that the completed assembly follows CIBSE's good-practice guides.