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 The Perko Powermatic concealed door closer from Samuel Heath has passed for use on one-hour fi re doors under the BS EN 1634-1 test for an unlatched door. Approval applies to both timber and mineral-composite doors.