The functioning of a fire resistant transfer grill is based on the dilatation properties of the intumescent materials in the profiles. When the room temperature reaches 100°C the material expands to attain several times its original thickness.The slats melt together to constitute a non-combustible mass that procures a fire-resistance similar to that of the construciton penetrated. This way, it impedes the passage of the flames, heat and gases.The intumescent grill is made of horizontal profiles filles with intumescent material.The aesthetic fire resistant grill can be mounted in walls, floors and doors.