Abstract: The invention relates to a mineral wool panel of increased structural strength, of the type of those used for the manufacture of air ducts, particularly airconditioning ducts, which are composed of a central core made of mineral wool, especially glass wool, coated on both faces with coatings, said core incorporating a web on the face located on the inside of the duct obtained, the panel of the invention being characterized in that it comprises a core (1) the surface faces of which, both the inner face and the outer face, each incorporate a respective web (2) extending over the totality of said faces, the two webs (2) being bonded to the surfaces of the core (1) by means of binders that can cure through the action of heat.