Pemko STC411™ Automatic Door Bottom

  • The acoustic automatic door bottom provides excellent performance for acoustic openings 
  • Independent testing has shown that the STC Series Automatic Door Bottom has "sealed-in-place" type performance
  • Meets ANSI Standard S12.60-2002, Acoustical Performance Criteria, Design Requirements, and Guidelines for Schools
  • Helps school projects earn LEED IEQ School Specific Credits for Enhanced Acoustical Performance
  • Smoother action positive seal mechanism. All Pemko automatic door bottoms consist of an aluminum case which surrounds a movable drop-bar seal. The drop-bar seal is actuated by a plunger which contacts the jamb as the door is closing, forcing the drop-bar seal down against the floor / threshold. 
  • Installation is fast and easy because disassembly is not required to change handing: simply flip the automatic door bottom and you’ve reversed the hand. 
  • End plate kits are included. Replacement part is K435. For doors narrower than 1-3/4", please specify K411 end plate kit. 
  • Available in any size ranging from 12" to 72".
  • Lead line available upon request; consult Customer Service for options on profiles.
  • The drop-bar seal actuation mechanism (all models) causes the drop-bar seal to always actuate on the hinge side first. This feature prevents the seal from skidding along the floor / threshold while the door is being closed. Door hang up will not occur.
  • Pemko automatic door bottoms are provided NET length


Air Infiltration Tested Air Infiltration Tested

Sound Tested - ASTM E90 Sound Tested - ASTM E90

BHMA Certified BHMA Certified

Smoke Tested - UL1784 Smoke Tested - UL1784

Fire Rated - UL10C - Positive Pressure Fire Rated - UL10C - Positive Pressure

Underwriters Laboratory 4L10 Underwriters Laboratory 4L10


A - Mill Finish Aluminum STC411APK: A - Mill Finish Aluminum with Black PemkoPrene insert

Pemko STC411_PK Acoustic Automatic Door Bottom Installation Instructions

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