Interior / Exterior Doors Posted by TRAdmin in 11 Nov 2015 Interior doors control the movement of people among school spaces, help control noise and air flow, and act as flame and smoke barriers during a fire. In a lockdown, they serve as safety barriers. Add to wish list Categories: All Equipment, School Corridors, School Grounds Related products Security Barriers Add to wish list Surfacing Add to wish list Floodlights Add to wish list Cleaning Machines Add to wish list