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Automatic Drop Seal (ADB)
Spring-actuated automatic door bottom seal in mortise, semi-mortise, and surface-mount configurations. ½" standard drop range (¾" extended for excessive gap profiles). Aluminum case with neoprene, silicone, TPV, or brush insert. BHMA A156.22 Grade 1; UL 10C / 1784; ASTM E283/E90.
Also known as
automatic door bottom · drop bar · ADB seal · automatic threshold seal
Key Features
- Drops as door closes for tight floor seal
- Lifts on opening to protect finished floor and threshold
- ADA-compliant low-closing-force variants available
- Three insert materials cover fire, smoke, and acoustic specs
Available Materials
Specifications
Component family
Browse the Commercial Door Hardware family →
Nylon brush sweeps, automatic drop seals (ADB), overlapping astragals, 3-piece perimeter seal kits, intumescent smoke seals, and STC-rated acoustic seals. BHMA A156.22 Grade 1, UL 10C / 1784, NFPA 80/105 listed.
Spec-equivalent for
Automatic Drop Seal (ADB) cross-references
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