KT-RV, 3-piece

Class 3: heavy-duty use. Hinges for doors subject to frequent use.

Class 7: 200,000 test cycles (only door hinges)

Class 4: Weight of test door 80 kg

class 0: not suited for use on fire and smoke-retardant doors (EN 1634-1)

The fundamental requirements on the safety of use must be fulfilled by all hinges. That's why there is only class 1 here.

Class 0: No protecion against corrosion/Class 4: 240h salt spray test(Class 5: 480h salt spray test*)

Class 1: Suited for use on intrustion-resistant doors based on the rating of the hinges' contribution to intrusion resistance for the respective intrusion-resistant door.

Class 11: Hinges comply with very frequent use