For either frame or door applications with standard intumescent strip neatly cuts grooves on doors or frames to accept intumescent strip which enables the formation of effective barriers to both fire and smoke by using alternative ball bearings diameters other seal thicknesses can be introduced alternative bearings can be purchased to suit other thicknesses for 40mm thick and 100mm width intumescent strip specifications d24 mm c10 mm b16 mm e4 mm shank diameter14 inch fire check30 minutes