KRALD* flaps are manufactured from the same materials as the KRAL model. It are made of aliminium profiles and waterproof drywall panel with a thickness of 12.5 mm. This make structure more durable and provides a higher level of sound insulation. Due to the considerable weight of the flaps, the product is equipped with safety arms that stabilize opening and prevent uncontrolled movement of the flap. In addition, the door can be easily coompletely dismantled, which facilitates installation, and access to the interior.