Pemko 434 Full Mortise Automat...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$131.40
$100.93
Pemko 434 Full Mortise Automatic Door Bottom - Mill Finish Aluminum, angled side view showing full 36-inch length

Pemko 434 Full Mortise Automatic Door Bottom with 1/2" Drop Seal - 30"-42" Length

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Model: 434ARL 30
$131.40
$100.93
Selected Finish is

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

$131.40
$100.93
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Pemko 434 Full Mortise Automatic Door Bottom

The Pemko 434 is a full mortise automatic door bottom engineered for demanding commercial applications where fire rating, smoke control, sound attenuation, and ADA compliance must all be satisfied by a single product. The drop-bar seal deploys automatically as the door closes - a plunger contacts the jamb stop and forces the seal down against the floor or threshold - then retracts fully when the door opens, eliminating drag and floor wear. Available in 30", 32", 36", and 42" lengths with three insert options to match your performance spec.

Choose Your Insert Type

  • Sponge Neoprene (RL): Compressible neoprene seal - best for uneven floors and maximum weather and smoke resistance.
  • PemkoPrene (PKL): Pemko's proprietary elastomeric insert - firm, durable, and suited for high-cycle commercial doors.
  • Dual Nylon Brush (NBL): Brush seal - ideal where floor contact drag must be minimized or where carpet transitions are present.

Key Features

  • Full Mortise Installation: Completely recessed into the door bottom - no exposed housing, no threshold interference, clean ADA-compliant profile.
  • Drop Range: Recommended 1/2" drop; maximum 3/4" drop capability for uneven or worn thresholds.
  • Aluminum Case: Heavy-duty extruded aluminum housing - corrosion-resistant, suitable for high-traffic commercial doors.
  • ADA Compliant: Low closing force operation meets ANSI A117.1 and ADAAG 2010 requirements for accessible door applications.
  • Automatic Operation: Plunger-actuated mechanism - hands-free, consistent seal every cycle.
  • 5-Year Warranty: Pemko manufacturer warranty.

Certifications & Ratings

  • BHMA Certified
  • Fire Rated - UL10C
  • Smoke Tested - UL1784
  • Underwriters Laboratory 4L10
  • GREENGUARD Gold Certified
  • Sound Tested - ASTM E90

Technical Specifications

  • Material: Aluminum
  • Width: 27/32"
  • Available Lengths: 30", 32", 36", 42"
  • Drop: Recommended 1/2"; maximum 3/4"
  • Use: Commercial

Typical Applications

  • Commercial office buildings and tenant suites
  • Healthcare and institutional facilities (fire/smoke corridor doors)
  • Educational buildings
  • Government and municipal buildings
  • Multi-family and mixed-use residential common areas
  • Retail and hospitality

Product Specs

Features:
Plunger-Actuated Automatic Drop Seal, Full Mortise Recessed Installation, Positive Seal Mechanism, Smooth Action, Hands-Free Operation
Warranty:
5 Year
Product Group:
Door Trim and Accessories
Product Subgroup:
Door Bottom Sweeps and Door Shoes
Product Type:
Automatic Door Bottoms
Subcategory:
Door Bottoms & Door Shoes
ANSI/BHMA:
BHMA Certified, Fire Rated - UL10C, Smoke Tested - UL1784, GREENGUARD Gold Certified, Sound Tested - ASTM E90
Commercial/Residential:
Commercial
Product Model:
434
Product Dimension:
L: 30", 32", 36", or 42" | W: 27/32" | H: 1-5/16"
Product Category:
Door Trim and Accessories
Product Substrate:
Aluminum
Department:
Door Hardware

Pemko 434ARL 30 – Frequently Asked Questions

1) Will a Pemko 434 automatic door bottom work on a fire rated corridor door?
The Pemko 434 is UL10C fire rated and UL1784 smoke tested, so it is built for fire and smoke rated openings such as hospital and school corridor doors. It is also BHMA certified, ASTM E90 sound tested, and GREENGUARD Gold certified, which matters if you are chasing indoor air quality credits on an institutional job.
2) My door has a worn threshold with about a 3/4 inch gap. Will a Pemko 434 still seal it?
Yes. The 434 drop seal is specified at a recommended 1/2 inch drop with a maximum 3/4 inch drop, so a worn or out-of-level threshold up to 3/4 inch is still within range. If the gap varies across the opening, the sponge neoprene insert is the one that compresses to uneven floors.
3) Which insert should I order on a Pemko 434 - neoprene, PemkoPrene, or nylon brush?
Pick by floor condition and traffic. Sponge neoprene (RL) compresses most, so it is the choice for uneven floors and the best weather and smoke resistance. PemkoPrene (PKL) is a firmer elastomeric insert made for high-cycle commercial doors. Dual nylon brush (NBL) is what you want over carpet transitions or anywhere seal drag has to stay low. All three come in every length: 30, 32, 36 and 42 inches.
4) Do I need to order a Pemko 434 to the exact door width or can I cut it down?
Order to the door width. The 434 comes in 30, 32, 36 and 42 inch lengths, so match the length to the leaf: a 36 inch door takes the 36 inch unit. This is a mechanical drop bar with a plunger at the hinge end, not a plain sweep you trim freely at the site.
5) Does an automatic door bottom add drag that fails an ADA door force test?
No. The 434 seal is only down when the door is closed and retracts as soon as the door opens, so it adds no sweep friction to the opening force. Pemko rates the low closing force operation to ANSI A117.1 and ADAAG 2010 for accessible openings.
6) Should I use a full mortise automatic door bottom or a surface mounted door sweep?
A surface sweep drags on the floor every swing and shows a housing on the face of the door. The 434 mortises fully into the bottom rail, so nothing is visible and the seal only touches down when the door closes, then lifts clear when it opens. That matters where you have carpet, finished flooring, or an accessible opening with a tight push/pull force budget. The tradeoff is labor: the door has to be routed, so a surface sweep is the faster retrofit on an existing leaf you cannot pull and machine.
7) How does the Pemko 434 door bottom actually operate - does it need power or an operator?
Purely mechanical, no power. A plunger on the end of the unit strikes the jamb stop as the door closes and pushes the drop bar down against the floor or threshold. Open the door and the bar retracts on its own. Nothing to wire, nothing for the buyer to adjust cycle to cycle.
8) Will a Pemko 434 help with sound transfer between a tenant suite and the corridor?
It contributes. The 434 is sound tested to ASTM E90, and closing the gap under the leaf is usually the single largest acoustic leak on a door. For sound work specifically, the sponge neoprene insert gives a compressible full-contact seal, where the nylon brush is chosen for low drag rather than sealing tightness.
9) What finish does the Pemko 434 come in?
Mill finish aluminum, on every length and every insert type. Since the unit mortises fully into the bottom rail, the case is hidden once the door is hung, so finish match with the rest of the door hardware is not a concern here.
10) Is the Pemko 434 rated for high traffic commercial doors or is it a residential part?
Commercial. The 434 uses an extruded aluminum housing that is corrosion resistant and specified for high-traffic commercial doors. For a property manager standardizing across a building, the PemkoPrene insert is the one Pemko calls out for high-cycle doors, which is the entrance and vestibule leaves rather than the back-of-house.
How fast can I get the Pemko 434ARL 30 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 434ARL 30 come with a warranty?
Absolutely. The Pemko 434ARL 30 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 434ARL 30?
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 434ARL 30 from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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