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 150mm width intumescent strip specifications d40 mm c15 mm b32 mm e4 mm shank diameter12 inch fire check45 minutes