... Door SealProduct Name: Conceal Fixed Automatic Drop Door SealProduct Function:Product Feature:The medium temperature smoke, draughts, air flow noise, traffic ... Stainless Steel End Plates with Screw Sealing Gap: from 3mm t o 15mm. Product Length: 400mm,600mm,820mm,910mm,1070mm,1200mm,1500mm ... Material: Silicon Rubber.Sketch Map: Automatic Drop Door bottom Seal (Good quality famous company in China)