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Pemko STC411APK Acoustic Full Mortise Automatic Door Bottom
The Pemko STC411APK is an architectural-grade full mortise automatic door bottom (ADB) engineered for high-performance soundproofing. Designed to be completely concealed within the bottom of the door, this unit features a sophisticated drop-bar mechanism that lowers a high-quality Acoustic PK (thermoplastic) seal only when the door is fully closed. This ensures a tight, consistent seal against the floor or threshold without the friction and "skidding" associated with traditional door sweeps.
High-Performance & Acoustic Features
- "Sealed-in-Place" Acoustic Performance: Independent testing confirms the STC Series provides a lab-quality seal, making it essential for meeting ANSI Standard S12.60-2002 acoustical criteria in schools and professional environments.
- LEED & Eco-Friendly: This product helps school projects earn LEED IEQ School Specific Credits for Enhanced Acoustical Performance and is GREENGUARD Gold Certified for low chemical emissions.
- Durable PK Insert: The thermoplastic insert offers the flexibility of natural rubber with superior resistance to cleaning fluids and disinfectants, ensuring longevity in high-sanitation commercial settings.
- Smooth Drop-Bar Actuation: The jamb-contacting plunger ensures hinge-side actuation, which prevents the seal from dropping until the door is nearly closed, protecting your flooring and reducing opening force.
- Fire and Smoke Certified: Fully compliant with UL 10C for positive pressure and UL 1784 for smoke leakage, ensuring safety and code compliance in fire-rated assemblies.
Technical Specifications
- Manufacturer: Pemko (ASSA ABLOY)
- Model: STC411APK (Mill Finish Aluminum)
- Mounting: Full Mortise (completely concealed)
- Dimensions: 9/16" Width | 1-3/8" Overall Height
- Compatibility: Non-handed; works for both right and left-handed doors.
- Door Width: Standard for 1-3/4" doors (special end plates available for narrower doors).
- Certifications: BHMA Certified, EPD, ASTM E90 (Sound), and ASTM E-283 (Air).
Pro-Tip for Soundproof Door Preparation
The Pemko STC411APK is the preferred choice for decorative and high-end doors where a visible surface-mounted seal would disrupt the aesthetic. Because it is fully mortised into the door's bottom rail, it is completely invisible when the door is open. For the best acoustic results, pair this door bottom with a high-performance perimeter gasket set to ensure no sound leaks through the jambs or header.
| Length | 36 Inch or 42 Inch or 48 Inch |
| Brand | Pemko |
| Insert Material | PemkoPrene |
| Fire Rated | Fire Rated |
| Sound Rated | Sound 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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