Pemko 5025ASB Mortise Retainer...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$16.27
$14.14
Pemko 5025ASB Mortise Retainer Brush Seal cross-section drawing showing 1/4" (6.4 mm) mortise width and 5/16" soft brush insert dimensions

Pemko 5025ASB Mortise Retainer Brush Seal with 5/16" Soft Brush Insert

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Model: 5025ASB 48
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$16.27
$14.14
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Pemko 5025ASB Mortise Retainer Brush Seal with 5/16"; Soft Brush Insert

Professional Mortise Retainer Weatherstripping Solution

The Pemko 5025ASB Mortise Retainer Brush Seal features a 5/16"; soft brush insert designed to provide optimal contact between the seal and surface. This aluminum-based weatherstripping effectively seals gaps up to 1/4"; with an overall height of 9/16"; and accommodates lengths from 24"; minimum to 96"; maximum. The compressed nylon filaments are set at a 45-Degree angle in aluminum casing for superior floor contact and remain flexible from -40-Degree Fahrenheit to above 400-Degree Fahrenheit melting point.

Professional Features & Benefits

  • Precise Gap Sealing: Effectively seals uneven gaps up to 1/4"; between door and door jamb for optimal weatherproofing performance.
  • Temperature Resilience: Brush remains flexible down to -40-Degree Fahrenheit with melting point above 400-Degree Fahrenheit for reliable operation in extreme conditions.
  • Optimal Contact Design: Compressed nylon filaments set at 45-Degree angle in aluminum casing provide superior contact with floor surfaces.
  • Custom Length Options: Available in lengths from 24"; minimum to 96"; maximum, sold by the foot for precise project requirements.
  • Multi-Surface Compatibility: Nylon filaments conform to irregular surfaces including carpet, stone, and grout lines for comprehensive sealing.
  • Fire Safety Compliance: UL 10C certified for positive pressure fire tests of door assemblies ensuring code compliance.
  • GREENGUARD Gold Certification: Meets strict chemical emissions standards for healthy indoor air quality in commercial environments.
  • Manufacturer Warranty: Backed by comprehensive 5-year warranty for long-term reliability and performance assurance.

Technical Specifications

  • Commercial/Residential: Commercial
  • Department: Door Hardware
  • Insert Type: Brush
  • Lock Type: Mortise
  • Product Category: Door Trim and Accessories
  • Product Group: Door Trim and Accessories
  • Product Model: 5025
  • Product Subgroup: Astragals, Gaskets and Weatherstripping
  • Product Substrate: Aluminum
  • Product Type: Weatherstripping
  • Subcategory: Gaskets & Weatherstripping
  • 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 weatherstripping products deliver professional-grade reliability with aluminum construction and densely compressed nylon filaments designed for demanding commercial applications. GREENGUARD Gold Certified and UL 10C compliant for fire safety, this mortise retainer seal provides UV-stable, long-lasting performance. Backed by a comprehensive 5-year warranty, Pemko weatherstripping solutions are engineered for dependable sealing performance where environmental control is essential.

Product Specs

Insert Type:
Brush
Warranty:
5 Year
Subcategory:
Gaskets & Weatherstripping
Product Group:
Door Trim and Accessories
Product Subgroup:
Astragals, Gaskets and Weatherstripping
Product Type:
Weatherstripping
Commercial/Residential:
Commercial
Lock Type:
Mortise
Product Model:
5025
Product Substrate:
Aluminum
Product Category:
Door Trim and Accessories
Department:
Door Hardware

Pemko 5025ASB 48 – Frequently Asked Questions

1) Will the Pemko 5025ASB brush seal close a 1/4 inch gap under a door that isn't level?
Gaps up to 1/4 inch are what the 5025ASB is built for, including uneven ones. The 5/16 inch nylon brush insert sits at a 45 degree angle in the aluminum retainer, so the filaments sweep the floor and take up variation as the gap opens and closes along the opening. Overall height of the assembly is 9/16 inch. If your gap runs wider than 1/4 inch at any point, this brush height won't bridge it and you want a taller insert.
2) Does the Pemko 5025ASB mount to the face of the frame or does it have to be mortised in?
It's a mortise retainer, so the aluminum carrier is set into a routed pocket rather than screwed onto the face of the stop. That means milling the frame or door edge to receive it, which is straightforward on a shop-prepped aluminum or hollow metal frame and a real job on an existing opening. If you need something that goes on an existing frame with no prep, a press-on or surface-applied gasket is the type to look at, such as the Hager 726S press-on smoke seal.
3) Can I use a brush seal like the Pemko 5025ASB on a fire rated door?
The 5025ASB is UL 10C certified for positive pressure fire tests of door assemblies, so it can be applied to a rated opening. Verify the specific listing on your door and frame label before you cut the frame for it, since the assembly's own listing governs what gasketing it accepts.
4) Should I use a brush seal or a neoprene insert weatherstrip for smoke and draft control on a commercial door?
They seal differently. The Pemko 5025ASB carries a 5/16 inch soft brush insert of nylon filament, which conforms to irregular surfaces such as carpet, stone and grout lines and seals uneven gaps up to 1/4 inch. The Hager 862S is a 48 inch weatherstrip with a neoprene insert intended for smoke and draft control, and it presents a continuous resilient face to the door instead of filament. On an opening where the door meets a flat, true jamb and you want a continuous compressed seal, the neoprene insert is the form to specify; where the surface is irregular or carpeted and a solid seal would drag or gap, the brush is the form that follows it.
5) Is there a weatherstrip I can install without mortising the door or frame?
Yes. The Hager 726S is a smoke seal weatherstrip with press-on installation in a charcoal finish, so it goes onto the frame face without cutting a groove. The Pemko 5025ASB is a mortise retainer, meaning the aluminum retainer seats into a mortise rather than surface-mounting. If you are retrofitting occupied units and do not want to route existing frames, the press-on 726S is the installation method that avoids that work; the mortise retainer is the one to specify when the frame is being prepped anyway or you want the retainer concealed.
6) Will a nylon brush seal work on a door that sweeps over carpet and tile grout lines?
That's the case where a brush beats a solid insert. The nylon filaments on the 5025ASB conform to irregular surfaces, carpet, stone and grout lines included, instead of hanging up on them like a neoprene or vinyl blade would. For a smooth threshold or where you want a tighter air and smoke seal against a flat surface, a neoprene insert type such as the Hager 862S or the adjustable jamb Hager 864S is the better fit.
7) Will the brush on the Pemko 5025ASB hold up in an unheated warehouse or a walk-in freezer vestibule?
Cold isn't the problem here. The compressed nylon filaments stay flexible down to minus 40 degrees Fahrenheit and the melting point is above 400 degrees Fahrenheit, and the retainer is aluminum. It's specified as a commercial product, which is what you want on industrial and warehouse traffic.
8) Does the Pemko 5025ASB meet indoor air quality requirements for a school or hospital?
GREENGUARD Gold Certified, which is the chemical emissions standard usually called for in schools and healthcare spaces. That plus the UL 10C certification is what gets a brush seal through a spec on an educational or institutional job.
9) What's the difference between the Pemko 5025ASB and a surface-mounted brush weatherstrip like the Cal-Royal BW-302?
Both carry a nylon brush in an aluminum retainer. The difference is how the retainer attaches: the 5025ASB is a mortise retainer that sets into a routed pocket for a flush, tamper-resistant result, while the Cal-Royal BW-302 is an extruded aluminum seal retainer applied to the surface. On new frames ordered with the prep, take the mortise version. On retrofit work where you are not routing an installed frame, take the surface type.
10) What should I use if the gap between the door and jamb varies from opening to opening?
Two approaches cover that. The Hager 864S is an 84 inch clear anodized aluminum adjustable jamb weatherstrip with a neoprene insert, so the seal position is adjusted at the jamb after hanging to take up whatever the gap turns out to be. The Pemko 5025ASB takes the other approach: the brush itself absorbs variation, with densely compressed nylon filaments set at a 45 degree angle sealing uneven gaps up to 1/4 inch. For a fleet of doors with inconsistent reveals, the 864S lets you dial each one in; the 5025ASB handles the variation without adjustment.
11) I need a specific length of jamb seal - do the alternatives come in the length I need?
Length is where these differ most. The Pemko 5025ASB runs from 24 inches minimum to 96 inches maximum and is sold by the foot, with stock sizes at 48, 68, 84 and 96 inches. Among the alternatives, the Hager 862S is a 48 inch weatherstrip and the Hager 864S is an 84 inch unit, so each covers one length rather than a range. If you are sealing a standard 84 inch leaf, both the 5025ASB 84 inch and the 864S land on it; for a tall or nonstandard opening, the 5025ASB is the one cut to the dimension.
12) Does a brush seal work as a substitute for a rated smoke seal?
Do not treat them as interchangeable by form alone. The Hager 726S and the Hager 862S are both described as smoke seals, with the 862S carrying a neoprene insert for smoke and draft control. The Pemko 5025ASB is a brush seal that is UL 10C certified for positive pressure fire tests of door assemblies, and it is also GREENGUARD Gold certified for indoor air quality. On a fire or smoke rated opening, match the seal to what the door assembly listing calls for rather than swapping brush for neoprene because both are jamb seals - filament and continuous neoprene behave differently against smoke passage.
13) What finish does the Pemko 5025ASB come in, and will it match anodized frames?
Mill finish aluminum is the finish offered, on every length. Mill is the raw uncoated aluminum, so against a clear anodized frame it reads close but not identical, and against dark bronze or painted frames it will stand out. On a mortised application most of the retainer buries in the frame anyway, which is why mill is the usual choice.
14) Which jamb seal holds up in an unconditioned space like a warehouse or exterior door?
The Pemko 5025ASB brush stays flexible down to -40 degrees Fahrenheit with a melting point above 400 degrees Fahrenheit, in an aluminum casing, and is specified for commercial use including industrial and warehouse facilities. The Hager 864S is a clear anodized aluminum jamb weatherstrip, so it brings an anodized aluminum body rather than mill finish. Both are aluminum-bodied; the difference for an exposed opening is that the 5025ASB seals with nylon filament that will not take a set in cold, while the 864S seals with a neoprene insert and adjusts at the jamb.
How fast can I get the Pemko 5025ASB 48 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 5025ASB 48 come with a warranty?
Absolutely. The Pemko 5025ASB 48 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 5025ASB 48?
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 5025ASB 48 from ZenSupply?
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