Pemko 420 Full Mortise Automat...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$79.60
$70.45
Pemko 420 Full Mortise Automatic Door Bottom, Mill Aluminum Finish PMK-420

Pemko 420 Full Mortise Automatic Door Bottom with 1/2" Drop - Mill Aluminum

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Model: 420APKL36

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

$79.60
$70.45
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Pemko 420 Full Mortise Automatic Door Bottom with 1/2"; Drop - Mill Aluminum

Professional Automatic Door Sealing Solution

The Pemko 420 Full Mortise Automatic Door Bottom provides comprehensive environmental sealing for hollow metal doors with a maximum drop of 1/2";. This commercial-grade aluminum door bottom features dimensions of W: 1-3/8", H: 13/16"; and comes in a standard 36"; length. Multiple insert options including AVL - Eco-V, APKL - PemkoPrene, and ASL - Sponge Silicone provide versatile sealing performance for various applications with comprehensive certifications including BHMA, UL10C fire rating, and GREENGUARD Gold certification.

Professional Features & Benefits

  • Precise Dimensions: W: 1-3/8", H: 13/16"; with 36"; standard length designed for seamless integration into hollow metal door construction.
  • Maximum Drop Capacity: 1/2"; maximum drop provides effective floor sealing for standard door applications.
  • Multiple Insert Options: Available with AVL - Eco-V, APKL - PemkoPrene, and ASL - Sponge Silicone inserts for customized sealing performance.
  • Comprehensive Environmental Sealing: Effectively seals against draft, dust, moisture, insects, fumes, light, and sound infiltration for complete door perimeter protection.
  • Durable Aluminum Construction: Mill aluminum finish provides long-lasting performance in demanding commercial door applications.
  • Extensive Certifications: Air infiltration tested, sound tested ASTM E90, BHMA certified, smoke tested UL1784, fire rated UL10C positive pressure, cUL listed 4L10, and GREENGUARD Gold certified.
  • Full Mortise Design: Professional installation method ensures clean appearance and optimal performance in commercial door systems.
  • Manufacturer Warranty: 5 Year warranty coverage provides confidence in long-term performance and reliability.

Technical Specifications

  • ANSI/BHMA: Air Infiltration Tested, Sound Tested ASTM E90, BHMA Certified, Smoke Tested UL1784, Fire Rated UL10C Positive Pressure, cUL Listed 4L10, GREENGUARD Gold Certified
  • Application: Wood or Hollow Metal Doors
  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Features: Seals to Keep Out Draft, Dust, Moisture, Insects, Fumes, Light, Sound
  • Insert Type: AVL - Eco-V, APKL - PemkoPrene, ASL - Sponge Silicone
  • Product Category: Door Trim and Accessories
  • Product Dimension: W: 1-3/8", H: 13/16";
  • Product Group: Door Trim and Accessories
  • Product Length: 36";
  • Product Model: 20
  • Product Subgroup: Door Bottom Sweeps and Door Shoes
  • Product Substrate: Aluminum
  • Product Type: Automatic Door Bottoms
  • Subcategory: Door Bottoms & Door Shoes
  • Warranty: 5 Year

Professional Applications

  • Commercial Office Buildings
  • Educational Facilities
  • Healthcare Institutions
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties
  • Government and Municipal Buildings

Why Choose Pemko Quality?

Pemko automatic door bottoms deliver professional-grade reliability with comprehensive testing including air infiltration, sound testing ASTM E90, BHMA certification, smoke testing UL1784, and fire rating UL10C positive pressure. The 5-year warranty and GREENGUARD Gold certification demonstrate Pemko's commitment to quality and environmental responsibility. Engineered for demanding commercial applications where dependable environmental sealing performance is essential.

Product Specs

Features:
Seals to Keep Out Draft, Dust, Moisture, Insects, Fumes, Light, Sound
Application:
Wood or Hollow Metal Doors
Insert Type:
AVL - Eco-V, APKL - PemkoPrene, ASL - Sponge Silicone
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:
Air Infiltration Tested, Sound Tested ASTM E90, BHMA Certified, Smoke Tested UL1784, Fire Rated UL10C Positive Pressure, cUL Listed 4L10, GREENGUARD Gold Certified
Commercial/Residential:
Commercial
Product Model:
20
Product Length:
36"
Product Dimension:
W: 1-3/8", H: 13/16"
Product Category:
Door Trim and Accessories
Product Substrate:
Aluminum
Department:
Door Hardware

Pemko 420APKL36 – Frequently Asked Questions

1) Will the Pemko 420 automatic door bottom work on a hollow metal door, or is it only for wood?
Both. The 420 is listed for wood or hollow metal doors, and it's a full mortise unit, so the door bottom edge has to be routed out to accept the housing rather than surface applied. The housing measures W: 1-3/8 inch, H: 13/16 inch, so you need a mortise pocket that depth and width in the bottom rail. On a hollow metal door that usually means factory prep, so check the door is prepped before ordering a mortise unit.
2) How big a gap under the door will the Pemko 420 seal?
Up to 1/2 inch. That is the maximum drop of the seal when the door closes and the plunger retracts. If your undercut to the finished floor is bigger than 1/2 inch at any point along the sweep, the 420 will not touch down and you need a deeper drop unit or a threshold to bring the floor up. Measure at the worst point of the swing, not at the center.
3) Which insert should I order on the Pemko 420 - Eco-V, PemkoPrene, or sponge silicone?
Three inserts are offered and they behave differently. ASL sponge silicone is the one to pick where the seal sees heat, since silicone holds up at elevated temperature better than a rubber compound. APKL PemkoPrene is the general commercial choice for draft, dust and sound on an interior opening. AVL Eco-V is the option to spec on a project chasing environmental credit. All three go in the same 420 housing, so the insert is a line item choice, not a different part.
4) Is the Pemko 420 automatic door bottom fire rated?
Fire rated to UL10C positive pressure, and cUL listed 4L10. It's also smoke tested to UL1784, sound tested to ASTM E90, air infiltration tested, BHMA certified, and GREENGUARD Gold certified. That combination is what a hospital, school or government spec typically calls for on a rated corridor door.
5) Should I use a full mortise automatic door bottom like the Pemko 420 or a surface mounted door sweep?
Different jobs. A surface sweep drags on the floor the whole time the door swings, so it wears, and it will not clear carpet or a raised floor. The 420 is a full mortise automatic bottom: the seal sits up inside the door while it swings and drops 1/2 inch only when the door closes against the stop. That gets you a seal against draft, dust, moisture, insects, fumes, light and sound without the sweep scraping. The tradeoff is prep, the door bottom rail must be mortised to take a 1-3/8 by 13/16 inch housing. If the door is already hung and you cannot rout it, a surface applied sweep or a semi mortise unit is the retrofit answer.
6) I'm standardizing door bottoms across a building - can I use the same Pemko 420 on both the wood office doors and the hollow metal stairwell doors?
Yes, one part covers both. The 420 is specified for wood and hollow metal doors alike, so a facility can carry a single mortise automatic bottom across mixed door types instead of stocking two. The constraint is not the door material, it's the prep and the undercut: every opening needs the bottom rail mortised for a 1-3/8 by 13/16 inch housing, and no opening can have more than a 1/2 inch gap to the finished floor. Since the unit is UL10C fire rated and cUL 4L10 listed, it also works on the rated stairwell doors that the office doors don't need.
7) What length does the Pemko 420 door bottom come in, and can I cut it down to fit my door?
Standard length is 36 inches, which covers a normal 3-0 opening. Automatic door bottoms of this type are cut to the door width less the mortise clearance, and the aluminum housing and the insert both trim. Cut from the end opposite the plunger so you keep the actuating mechanism intact.
8) Will the Pemko 420 help with sound transfer between a corridor and an office?
It's the right class of part for it. The 420 seals against sound as well as draft, dust, moisture, insects, fumes and light, and the assembly is sound tested to ASTM E90. The gap under a door is usually the largest single leak path in an otherwise solid opening, so closing it with an automatic bottom is the first move. You still need gasketing on the jambs and head to get the full benefit, the bottom alone will not do it.
9) Is the mill aluminum finish on the Pemko 420 going to be visible once it's installed?
Barely. The housing is aluminum in a mill finish and it mortises up into the bottom edge of the door, so from a normal standing view you see the bottom edge, not the face. Mill aluminum is the raw unfinished mill surface, which is the standard low cost choice where the part is concealed. It's a commercial rated part, not a residential one, so the finish is chosen for the pocket it lives in.
10) Does a GREENGUARD Gold certified door bottom matter for a LEED or school project?
It can. GREENGUARD Gold certification on the 420 covers low chemical emissions, which is the criterion that comes up on schools, healthcare and projects pursuing indoor air quality credit. If that's the driver on your job, pair it with the AVL Eco-V insert, which is the environmental insert option in the family.
How fast can I get the Pemko 420APKL36 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 420APKL36 come with a warranty?
Absolutely. The Pemko 420APKL36 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 420APKL36?
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 420APKL36 from ZenSupply?
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