Element essentially made of mineral wool which has a reinforced reaction to fire. Such an element is in particular shaped in the form of a panel and is used for the construction of air ducts. The panels comprise a glass wool core, said core being formed of glass fibers which act as components of the wool. The glass fibers of the element according to the invention have a substantially larger diameter compared to the diameter of the glass fibers which are currently used for the manufacture of panels or ducts of similar application. The glass fibers used according to the invention have a fineness index of a value which fluctuates between 5, 8 .plusmn. 0.5 for 6 grams. The invention also relates to a method of manufacturing an air duct from said panels.
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