- ABS frame up to size 630, PVC from size 710 - PVC slats - RAL 7035 grey colour - from size 560 inclusive, the flaps are equipped with a transverse division (central reinforcement) - maximum ambient temperature +70 °C - maximum speed 12 m/s - explosion-proof Ex version - WSK-Ex, RAL 9005 (must not be exposed to temperatures higher than 60 °C)