Automatic, Non-Handed, Reversible Ideal for Use With Carpeted Interiors Door bottom seals consist of a variety of solutions for sealing a door to the threshold or floor surface. Pemko Commercial Medium-Duty Automatic Door Bottoms consist of an aluminum case which surrounds a movable drop bar seal. The drop bar seal is actuated by a plunger which contacts the jamb as the door is closing, forcing the drop bar seal down against the floor or threshold. When the plunger contacts the jamb, the drop bar seal actuates from the hinge side first allowing multiple compression points. The plunger requires Low closing force. Color: Aluminum Length: 42