The British Standard 9999:2017 gives clear guidance that covers routine visual inspection and maintenance of ventilation and air conditioning ductwork and states that all fire dampers should be tested not exceeding a 12 months period. As the building owner / responsible person on-site you need to ensure that all fire and smoke dampers within your building(s) are located, serviced and tested (whether that be a drop test or otherwise). 

MINT Contracting Services, can help you to ensure you meet the regulatory requirements and support you in compiling an asset list and schedule to ensure regular checks are carried out for continued safe operation.