Invention relates to filters capable to filter and absorb heat generated during activation of fire suppressing gas generating devices. A filtering and heat absorbing filter comprises at least the following layers: an inner layer of a steel mesh as a first layer disposed to an environment to be burned; an outer layer of the steel mesh as a last layer disposed to an environment to be protected from the by-products created during chemical reaction of the fire suppressing gas generating grains; and at least three intermediate layers, wherein each intermediate layer comprises a layer of a steel wool and a layer of a high silica glass fibre mat.