InterDam is a major supplier of blast and passive fire protection products for the global industry, principally walls, doors and window systems. InterDam has experience of providing products in fire resistant classes according to international tunnel Standards RWS / HCM / ISO 834. InterDam is well versed in the key difference between tunnel doors and most other types of fire resistant doors: Tunnel doors are escape doors and are only used in case of an emergency. Rigorous testing, use of the best materials, proper dimensioning of all materials and regular maintenance assures the door functions as specified. Get the people to safety and keep the fire out. Always. Guaranteed.