Background When Andrew Ashley, the MD of Clark Doors wanted an innovative door curtain tested, he scanned the scientific literature for someone that could help. He found that Dr Alan Foster at RD&T had published several research papers on infiltration through cold store entrances 1,2 and that he had experience in measuring air curtain effectiveness 3,4 . The patented Clark Doors rapid roll door, designed for cold stores (Coldmaster), had

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