Crono Crono Crono Specification Acoustic insulation from 38 dB to 42 dB Thermal transmittancefrom 1,8 W/m2k to 1,4 W/m2k Wind resistancefrom 3C to 5C Waterproof resistancefrom n.p.d. to 3A Air permeabilityfrom 2 to 4 European Cylinder Lock 13 fixing points Close Download section Armored doors data sheet - Class 3 Crono (.pdf, 244 kB) Close N300 SecurityEquipped with European Cylinder T 300 SECURITYEuropean Cylinder Lock T 300 APP