Automatic Door Bottoms:

Low Closing Force Automatics Available
Full Mortise & Surface Type Door Bottoms are reversible (non-handed). Furnished with closed cell sponge neoprene gaskets.
May be trimmed 4" from lock end only, unless bottom is under 30" in length.
Max. Drop 7/8"
Fire Rated: Door Bottom Seals for use on wood or steel doors in up to 3-hour locations.