Abstract: A sealing system which can be used to close to the opening of a dwelling or other building to prevent water, mud and other products from seeping into said dwelling. The inventive sealing system comprises a central panel consisting of two parts (10a, 10b) whereby said panel can be adapted to the dimensions of the opening that is to be protected; a peripheral inflatable air chamber (20) ensuring the tightness of said system; and a profiled frame (30) which is fixed to the periphery of the central panel (10) in order to guide and support the inflatable air chamber (20). The panel also comprises a central extension (50) which matches the shape of the profiled frame (30) and two parts (10a, 10b), which together form a lode wherein the two parts (10a, 10b) can be inserted, in addition to a guiding element (70) which serves as a support for the two parts (10a, 10b) and prevents the inflatable air chamber (20) from extending into the central part towards the inside of the lode.