The 4301DPKL36 automatic door bottom installs on the bottom rail of doors to seal the gap between door and floor. This heavy-duty drop-down seal prevents air, smoke, sound, and moisture infiltration when the door closes. Pemko designed this 36-inch unit for commercial and institutional applications where energy efficiency and fire-life safety compliance matter.
The semi-mortise mounting design works on most door types. The PemkoPrene seal drops automatically when the door closes, creating a tight barrier against drafts and contaminants. Dark bronze anodized aluminum construction provides corrosion resistance and matches common hardware finishes. Surface or semi-mortise installation gives you flexibility on different door configurations.
| Length | 36 inches |
|---|---|
| Height | 1-25/32 inches |
| Material | Anodized Aluminum with PemkoPrene Seal |
| Finish | Dark Bronze Anodized |
| Mounting | Semi-Mortise/Surface Mount |
| Warranty | 5 Years Limited |
This door bottom meets UL 10C fire door assembly standards and UL 1784 air leakage requirements. ANSI/BHMA A156.22 door gasketing compliance and ASTM E283 air infiltration testing ensure code compliance. GREENGUARD Gold certification confirms low chemical emissions for indoor air quality.
Fire-rated door assemblies require proper gasketing to maintain their UL 10C listing during annual inspections. For complete egress door compliance in assembly occupancies, review NFPA 101 Life Safety Code requirements that work alongside proper door sealing systems.