Manufactures FD30, FD60, FD90 and FD120 timber fire doorsets, flat entrance doors and glazed screens from its Doncaster factory, with a second facility in Birmingham. Holds BM TRADA Q-Mark Fire Door Manufacture certificate 879-APR and Q-Mark Enhanced Security Door certificate 097-APR, giving dual fire and security certification on flat entrance doorsets. The Knowles range additionally carries IFC certification.