Pemko 434ARL32 32" 2' 8" Full Mortise Automatic Door Bottom with Sponge Neoprene Mill Finish Aluminum Finish

The 434ARL32 full mortise automatic door bottom seals the gap under doors when closed. This 32-inch unit installs into the door bottom edge and drops a sponge neoprene seal bar when the door closes. It prevents air leakage, smoke infiltration, and sound transmission that compromise building energy efficiency and occupant comfort.

Pemko designed this automatic door bottom with a low-force mechanism that activates reliably without interfering with door operation. The mill finish aluminum body houses the drop-down seal assembly. The sponge neoprene provides consistent contact with floor surfaces while maintaining flexibility over time. This unit can be field-trimmed up to 2 inches and works on both wood and metal doors.

Fire-rated door assemblies often require gasketing systems that maintain their UL 10C listing while providing smoke control. For buildings with complex egress requirements, NFPA 101 compliance guides proper door assembly specifications.

Material	Anodized Aluminum, Sponge Neoprene
Length	32 inches
Mount Type	Full Mortise
Finish	Mill Aluminum
Warranty	5 Years Limited

This door bottom meets UL 10C fire testing standards, UL 1784 air leakage requirements, ANSI/BHMA A156.22 gasketing specifications, and ASTM E283 air infiltration testing. GREENGUARD Gold certification confirms low chemical emissions for indoor air quality.