Top hung sliding blast doors provide excellent blast resistance while maintaining a low building profile and are great for applications where space is tight. Features and options: Drive options include fully manual, chain operated, pneumatic or electrically driven with emergency manual releaseMeets UFC 4-010-01 DOD Minimum Antiterrorism Standards for BuildingsMeets "fail not fall" criteriaOptional canopy for exterior doorsStandard hardware provided but can be customized to suit your specific hardware schedule.