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Professional Door Floor Seal Aluminium Natural Anodised Lowering Seal DDS 12 Startec for Soundproofing Doors - Interior Doors & Room Doors Seal height: ≤ 11 mm, design: lowering seal for grooving with one-sided release for sound-reducing doors (DIN 4109) Profile can be shortened on one side by ≤ 100 mm - rubber draught excluder for smoke protection doors according to EN 1634-3 and fire doors according to EN 1634-1 Sound insulation value: 49 dB at ground gap 7 mm - installation dimensions: groove: 12 x 31 mm - stop: rail DIN left and DIN right Box contents: 1 x door floor seal DDS 12 lowering seal for wooden doors, 2 x mounting brackets and 1 x release plate with screws, note on function: draught excluder only works when a counter-pressure is applied, the entire rail goes down.