A nylon brush strip seal that is fitted in a concealed manner into a machined groove in a door. Where a small clearance is encountered, the groove should be double morticed to allow the brush to flex. Location Door bottoms, single, double or sliding, double acting. Meeting stiles. Min/Max Gap Up to 19mm (user determined). Seal Sizes Available in stock lengths. Fixing Method Bowed and inserted in mortice groove. (builder's adhesive if required). Seal Material Fine, dense, black nylon filaments, UV stabilised. Galvanised steel spine.