Shandong Asico Door manufactures fire-rated timber and hollow-metal doorsets and pressed steel frames from Gaomi, supplying international hotel brands including Marriott, Hilton and Holiday Inn. Its steel fire doors are declared against UL 10C, UL 10B, NFPA 252, ASTM E2074 and CAN/ULC-S104, and the company states it holds UL certification and BM TRADA certification with fire testing carried out at Chiltern International Fire, BM TRADA’s fire laboratory. Timber doorsets run from twenty minutes on particleboard or structural composite lumber cores up to ninety minutes on mineral core. Certificate numbers are not published, so the UL file number and BM TRADA Q-Mark reference are worth obtaining before specifying.