Performance- Complies with ANSI A156.2, Series 4000, Grade 2, (400,000 cycles), UL/ULC listed for 3 hour fire door. ANSI A117.1 American Disabilities Act (ADA)
Chassis- Cylindrical, steel - coated with zinc dichromate (corrosion resistance), freewheeling clutch (added security from hammer attacks), independent spring cages.