Rigid intumescent fire and smoke seal, twin fin

An intumescent seal for the gap between leaf and frame of steel and timber fire doors. In a fire the strip expands and closes the gap, holding back smoke, toxic gas and heat and slowing the spread of fire. It is glued into a groove in the frame or the leaf edge; the mill can supply it with adhesive backing, or it can be fixed into the groove with small pins.

Rigid, with two soft black fins running side by side near one edge. The mill lists it as a fire, smoke and acoustic seal. Thickness x width (mm): 4x10, 4x15, 4x20, 4x25, 4x30, 4x38, 6x10, 6x15, 6x20, 6x25, 6x30, 6x38, 6x40. Bars of 2100 mm. The catalogue prints no activation temperature, expansion ratio or fire test certificate.