Pemko STC411 Acoustic Automati...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$162.58
$89.41
Pemko STC411 Automatic Door Bottom cross-section diagram showing 9/16 inch width and 1-3/8 inch height dimensions with mounting screws

Pemko STC411 Acoustic Automatic Door Bottom with ANSI S12.60 Compliance

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Model: STC411APK26

In Stock (leaves warehouse same day if ordered before 3pm ET)

$162.58
$89.41
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Pemko STC411 Acoustic Automatic Door Bottom, ANSI S12.60 Compliant

Professional Acoustic Sealing for Educational and Commercial Applications

The Pemko STC411 Acoustic Automatic Door Bottom delivers certified sound control performance with ANSI Standard S12.60-2002 compliance, the benchmark specification for acoustical performance in schools and other critical listening environments. The aluminum housing carries a movable drop-bar seal (H: 1-3/8", W: 9/16") and is available in lengths from 26" to 48". Independent testing confirms "sealed-in-place" type performance. BHMA certified, UL10C fire rated (positive pressure), cUL Listed 4L10, and air infiltration tested.

Features & Benefits

  • ANSI S12.60-2002 Compliance: Meets Acoustical Performance Criteria, Design Requirements, and Guidelines for Schools - supports LEED IEQ School Specific Credits.
  • Sealed-in-Place Performance: Independent testing confirms acoustic sealing performance comparable to permanent installations for demanding sound control applications.
  • Reversible Hand Design: No disassembly required to change handing - simply flip the unit to reverse the hand, speeding installation.
  • Hinge-Side First Actuation: The drop-bar seal always actuates on the hinge side first, preventing skidding along the floor and eliminating door hang-up.
  • Smooth Positive Seal Mechanism: Drop-bar seal is actuated by a plunger that contacts the jamb as the door closes, forcing the seal down against the floor or threshold.
  • Complete Installation Kit: End plate kits included. Replacement part K435 available. For doors narrower than 1-3/4", specify K411 end plate kit.
  • 5-Year Warranty: Manufacturer warranty provides long-term protection for commercial installations.

Technical Specifications

  • ANSI/BHMA: BHMA Certified, Fire Rated UL10C Positive Pressure, cUL Listed 4L10, Air Infiltration Tested
  • Acoustic Standard: ANSI S12.60-2002
  • Material: Aluminum
  • Insert Type: Black PemkoPrene Insert
  • Dimensions: H: 1-3/8", W: 9/16"
  • Available Lengths: 26", 28", 30", 32", 34", 36", 42", 48"
  • Use: Commercial
  • Warranty: 5 Year

Typical Applications

  • Educational Facilities Requiring ANSI S12.60 Compliance
  • Commercial Office Buildings with Acoustic Requirements
  • Healthcare Institutions with Sound Control Needs
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings
  • LEED-Certified Construction Projects
  • Fire-Rated Door Assemblies

Pemko STC411 Acoustic Automatic Door Bottoms combine aluminum construction, BHMA certification, and ANSI S12.60-2002 compliance in a reversible, easy-install package. Multiple UL ratings - including fire-rated UL10C positive pressure - make this a single-spec solution for projects where acoustic performance and fire compliance must coexist.

Product Specs

Subcategory:
Door Bottoms & Door Shoes
Insert Type:
Black PemkoPrene Insert
Warranty:
5 Year
Product Group:
Door Trim and Accessories
Product Subgroup:
Door Bottom Sweeps and Door Shoes
Product Type:
Automatic Door Bottoms
ANSI/BHMA:
BHMA Certified, Fire Rated UL10C Positive Pressure, cUL Listed 4L10, Air Infiltration Tested
Commercial/Residential:
Commercial
Product Model:
STC411
Product Length:
26", 28", 30", 32", 34", 36", 42" or 48"
Product Dimension:
H: 1-3/8", W: 9/16"
Product Category:
Door Trim and Accessories
Product Substrate:
Aluminum
Department:
Door Hardware

Pemko STC411APK26 – Frequently Asked Questions

1) Will the Pemko STC411 automatic door bottom fit a door narrower than 1-3/4 inches thick?
Yes, but you have to order the right end plates. The STC411 ships with end plate kits included, and for doors under 1-3/4 inches thick you specify the K411 end plate kit. On standard 1-3/4 inch commercial doors the included kit is what you want. K435 is the replacement part number if you need to re-order plates later.
2) What length Pemko STC411 do I order for a 36 inch door?
Order the 36 inch STC411. The unit is sold cut to door width in 26, 28, 30, 32, 34, 36, 42 and 48 inch lengths, so you match the length to the door leaf width rather than the opening. For an odd width, the usual trade practice is to take the next size up and trim the aluminum housing down.
3) How much space does the STC411 automatic door bottom need under the door?
The housing measures 1-3/8 inches high by 9/16 inch wide, so you need a 9/16 inch wide pocket or a mortise of that width if you are recessing it, plus 1-3/8 inches of vertical room for the body. It is a surface or mortise aluminum extrusion with a drop bar that extends below that dimension to meet the floor, so undercut the door for the gap you actually have at the threshold.
4) Do I need to order the Pemko STC411 handed, left or right?
No handing to specify. The STC411 is reversible without disassembly, so you flip the unit on the bench to change hand. One part number covers both hands, which matters if you are buying a quantity for a floor of doors and do not want to sort left from right on site.
5) Can an automatic door bottom be used on a fire rated door assembly?
The STC411 is UL10C fire rated for positive pressure and cUL Listed 4L10, so it can go on a fire rated assembly. That combination is the reason to pick it over an acoustic seal that carries no fire listing, because in a school or hospital corridor the same door usually has to do both jobs.
6) Does the Pemko STC411 meet the acoustic requirement for classrooms?
It is built to ANSI S12.60-2002, the acoustical performance criteria standard for schools, and independent testing puts it in the sealed-in-place performance class. It is also BHMA certified and air infiltration tested. That is what a spec calling out S12.60 on classroom doors is asking for.
7) How does an automatic door bottom differ from a regular door sweep?
A sweep drags on the floor all the time. The STC411 carries a drop bar seal actuated by a plunger that hits the jamb as the door closes, pushing the seal down to the floor and lifting it clear when the door opens. That means no drag on carpet or finished flooring, and no wear from constant contact. If the opening has a threshold and no acoustic or smoke requirement, a plain sweep is simpler and cheaper; if you are sealing sound or air, the drop bar is the one that actually seals.
8) Will an automatic door bottom skid or catch on the floor when the door closes?
Not on the STC411. The drop bar always actuates on the hinge side first, so the seal comes down at the pivot end and rolls toward the strike rather than dropping flat and scrubbing across the floor. That is what keeps it from hanging up the door on a high spot in the finish floor.
9) Does the Pemko STC411 come with everything needed to install it, or do I have to order mounting hardware separately?
End plate kits come with the unit, so the standard install needs nothing else beyond fasteners into the door. The one thing to catch at order time is door thickness: under 1-3/4 inches you call out the K411 end plate kit instead of the standard one.
10) What is the seal on the Pemko STC411 made of, and can it be replaced?
The housing is aluminum with a black PemkoPrene insert as the sealing element. Aluminum plus a synthetic insert is what lets it carry the fire listing and hold up in commercial traffic. K435 is the replacement part to order for service work.
11) Is the STC411 automatic door bottom suitable for apartment or residential unit doors?
It is a commercial-rated product, and it gets used on multi-tenant residential entry doors where sound transfer between units is the complaint. For a single-family interior door it is more hardware than the job needs. Where it earns its place is a corridor door in an apartment building, hotel, or dorm that also has to hold a fire rating.
12) Does the STC411 count toward LEED credits on a school project?
Its ANSI S12.60-2002 compliance supports LEED IEQ School Specific Credits, which is the acoustic performance credit on educational projects. If your submittal package is chasing that credit, the S12.60 compliance is the line the reviewer is looking for.
How fast can I get the Pemko STC411APK26 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Pemko STC411APK26 come with a warranty?
Absolutely. The Pemko STC411APK26 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Pemko STC411APK26?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Pemko STC411APK26 from ZenSupply?
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