The CCE Superior Drop Down Door Seal is designed to form an effective barrier against fire and smoke, which is activated by the closing action of the door, meaning the seal only drops down when the door is closed. This high-performing drop down seal is Certifire approved, with a 120 minute fire resistance rating. Trimming: 150 mm standard from opposite end of plunger 50 mm | l. 330 mm 135 mm | l. 430 mm lengths : 330 430 530 630 730 830 930 1030 1130 1230 mm