Heavy Duty Concealed

CT-54N Heavy Duty Concealed ADB
for Standard Hollow Metal Doors

When nothing but the best will do for the bottom of your hollow metal doors.

K.N. Crowder Automatic Door Bottoms (ADB) are made from extruded aluminum combined with closed cell sponge neoprene, silicone, felt or brush.

It is activated when a plunger depresses against the door stop or jamb, sealing out draft, sound and light.

Surface or mortise types available in stock sizes 24", 30", 36", 42" and 48". These can be shortened up to 6" (from lock side) on job site (24" can be shortened 3" only).

Reversible for right or left hand installations. Maximum drop is 7/16". Also available in gold and bronze anodized.

Designs
Specifications
Downloads

Heavy Duty Concealed

Non fire rated
Extruded anodized aluminum with neoprene seal
Bronze or gold anodized, stainless steel options
Vinyl seal option (fire rated)
7/16" maximum drop
1" thickness x 1-3/8" height
Heavy duty concealed (full mortised)

Feature Overview

Non fire rated
Extruded anodized aluminum with neoprene seal
Bronze or gold anodized, stainless steel options
Vinyl seal option (fire rated)
7/16" maximum drop
1" thickness x 1-3/8" height
Heavy duty concealed (full mortised)

Specifications

Extruded aluminum and neoprene is activated automatically when plunger depresses against door stop or jamb sealing out draft, sound and light.
Fits into the recess of a standard hollow metal door. Available in stock sizes of 24", 30", 42" or 48" which can be shortened up to 6" on the job (24" can be shortened 3" only).
Maximum drop 1/2". 1/4" "shim" to be used where required (please specify). Allow 3/16" minimum operating clearances.
Extruded aluminum & neoprene can be easily adjusted while on the door.
Doors cut too short are no longer a problem.