Air seal for a liftable closure

An air sealing device for a liftable closure comprising a closure element slidably mounted along vertical guide elements of a portal structure so as to be movable between a lowered configuration in which it closes an opening defined by said portal structure, and a raised configuration in which said opening is open, and a compartment arranged above the portal structure to accommodate the closure element in its raised configuration, which compartment is delimited by a front wall spaced from the portal structure, a transverse space being defined between the closure element and said front wall which communicates on one side with said compartment and on the other side with the outer environment, the device including a first and a second sealing member, one of which is connected to said front wall on the side facing the compartment and supports a ferromagnetic plate, the other of which is a magnetic member, fixed on the surface of the closure element that faces the outside of the portal structure, said sealing members being adapted to reach respective mutually facing positions in the completely lowered configuration of the closure element to adhere to each other as a result of their magnetic attraction in order to close said transverse space for preventing communication between said compartment and the outer environment,

• the sealing member connected to said front wall comprising a base structure adapted to be fixed to said front wall in an adjustable manner by a first fastener, said ferromagnetic plate being supported by the base structure in an adjustable manner by a second fastener, so that said ferromagnetic plate can be fixed to the front wall in a position that corresponds precisely to the position reached by said sealing member fixed to the surface of the closure element when the latter is in its lowered configuration,
• the base structure of the sealing member connected to the front wall comprising at least one L-shaped angular section bar arranged substantially perpendicular to said vertical guide elements, wherein each of said angular section bars has a first wing intended to be applied to the front wall and provided with a series of first slots directed transverse to its axial direction which form part of said first fastener, at least some of said first slots being adapted to be engaged by respective adjustable fastening members projecting from the front wall, and a second wing substantially perpendicular to the front wall for the connection of a lamina connected to said ferromagnetic plate and having a series of second slots, and in which a series of third slots is formed in said lamina which are directed perpendicular to the ferromagnetic plate, a pair of slots of said series of second and third slots, both being engaged by adjustable rod-shaped fixing members which are part of said second fastener, each of which preferably comprises a nut screw and a respective tightening nut.