Pemko 411APKL 36" Full Mortised Automatic Door Bottom - PemkoPrene Insert
The Pemko 411APKL is an architectural-grade concealed automatic door bottom (ADB) engineered to provide a high-performance seal at the base of the door. Designed for full mortise installation, this 36" unit is completely invisible when the door is open, making it the ideal hardware for upscale condos, luxury hotels, and decorative office doors. It features a sophisticated drop-bar mechanism that lowers a high-durability PemkoPrene (PK) insert only when the door is closed, effectively blocking sound, smoke, drafts, and light.
High-Performance & Life Safety Features
- Premium PemkoPrene™ (PK) Seal: This thermoplastic elastomer possesses the flexibility and durability of natural rubber but offers superior resistance to cleaning fluids and disinfectants. It remains resilient under high-frequency use and extreme temperatures.
- Fire and Smoke Certified: Fully compliant with UL 10C for positive pressure and UL 1784 for air leakage, making it a critical component for fire-rated door assemblies in hospitals, schools, and dormitories.
- Acoustic and Energy Efficient: Tested to ASTM E90 for sound attenuation and ASTM E-283 for air infiltration, this seal creates a "sealed-in-place" barrier that significantly enhances privacy and reduces HVAC costs.
- Frictionless Hinge-Side Actuation: The drop-bar mechanism is actuated by a jamb-contacting plunger, ensuring the seal only drops in the final moments of door closure to prevent seal skidding, floor damage, and door hang-up.
- Versatile Sizing: This 36" stock length is provided at NET length and can be field-trimmed by up to 2" for a precise fit on custom-width doors.
Technical Specifications
- Manufacturer: Pemko (ASSA ABLOY)
- Model: 411APKL (Mill Finish Aluminum)
- Insert Material: Gray PemkoPrene (PK)
- Mounting: Full Mortise; Non-handed (simply flip the unit to change handing).
- Dimensions: 9/16" Width | 1-3/8" Overall Height.
- Door Compatibility: Fits 1-3/4" and 1-3/8" thick doors (specify K411 end plate kit for 1-3/8").
- Gap Coverage: Effectively seals gaps up to 3/4" under the door.
Pro-Tip for Professional Installations
The Pemko 411APKL is favored by architects for its clean, symmetrical square-shaped case that allows for even flush mounting. Because it is fully mortised, it does not affect the door's appearance. For the best results, adjust the plunger so the drop bar exerts uniform pressure against the threshold or floor across the entire 36" width, ensuring maximum acoustic and smoke protection.
| Length | 36 Inch |
| Brand | Pemko |
| Insert Material | PemkoPrene |
| Fire Rated | Fire Rated |
| Mounting Type | Full Mortise |
| Bottom Weatherseal Type | Automatic Door Bottom |
| Housing Finish | Aluminum |
| Sweeps, Door Bottom or Rain Drip | Door Bottom |
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