Pemko 18041 180-Degree Aluminu...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$27.07
Pemko 18041 180-Degree Aluminum Fire-Rated Door Bottom Weatherstrip with 3/8" Nylon Brush - UL10C Certified

Pemko 18041 180-Degree Aluminum Fire-Rated Door Bottom Weatherstrip with 3/8" Nylon Brush - UL10C Certified

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Model: 18041CNB 36IN
$27.07
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$27.07
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Pemko 18041 180-Degree Aluminum Fire-Rated Door Bottom Weatherstrip

The Pemko 18041 is a 180-degree aluminum retainer door bottom sweep rated for fire door applications. The extruded aluminum body accepts a replaceable nylon brush insert (3/4" depth) that seals gaps from 1/32" to 1/16". Certified to UL10C positive pressure, smoke tested to UL1784, and BHMA certified. NFPA 80 compliant for fire door pairs. GREENGUARD Gold certified for low chemical emissions.

Certifications and Compliance

  • UL10C Fire Rated, Positive Pressure tested
  • Underwriters Laboratories 4L10
  • Smoke Tested to UL1784
  • BHMA Certified
  • NFPA 80 compliant for fire door pairs
  • GREENGUARD Gold Certified

Technical Specifications

  • Model: 18041
  • Material: Aluminum
  • Insert Type: Nylon Brush, 3/4" depth
  • Brush Seal Range: 1/32" to 1/16" gap
  • Profile Dimensions: W: 1-1/8", H: 1/4"
  • Available Lengths: 36", 48", 84", 96"
  • Available Finishes: Clear Anodized Aluminum, Dark Bronze Anodized Aluminum, Black Suede Powder Coat
  • Insert Options: Nylon Brush, Soft Brush
  • Warranty: 5 Year
  • Application: Commercial

Typical Applications

  • Fire-rated door assemblies requiring NFPA 80 compliance
  • Commercial office buildings
  • Educational and healthcare facilities
  • Government and municipal buildings
  • Multi-tenant residential properties
  • Industrial and warehouse facilities

Product Specs

Insert Type:
Nylon Brush
Warranty:
5 Year
Subcategory:
Door Sweeps
Product Group:
Door Trim and Accessories
Product Subgroup:
Astragals, Gaskets and Weatherstripping
Product Type:
Weatherstripping
ANSI/BHMA:
BHMA Certified, Smoke Tested - UL1784, Fire Rated - UL10C Positive Pressure, UL 4L10, GREENGUARD Gold Certified
Commercial/Residential:
Commercial
Product Model:
18041
Product Length:
36", 48", 84", or 96"
Product Dimension:
W: 1-1/8", H: 1/4"
Product Category:
Door Trim and Accessories
Product Substrate:
Aluminum
Department:
Door Hardware

Pemko 18041CNB 36IN – Frequently Asked Questions

1) Can I use the Pemko 18041 door sweep on a fire-rated door?
Yes. The Pemko 18041 door bottom is fire rated to UL10C under positive pressure, smoke tested to UL1784, carries UL 4L10, and is BHMA certified. It's also called out as NFPA 80 compliant for fire door pairs, so it can go on both leaves of a rated pair. If you're specifying for a hospital, school, or government facility, it's also GREENGUARD Gold certified for low chemical emissions.
2) How big a gap under the door will the 18041 brush sweep actually seal?
The nylon brush insert on the 18041 is built to seal a gap of 1/32 inch to 1/16 inch. That's a tight undercut. If your doors are swinging over carpet or an uneven slab with a half-inch gap at the bottom, a brush sweep in this range won't close it and you want a deeper sweep or an automatic door bottom instead. Measure the worst opening in the run before you order for a whole floor.
3) What length Pemko 18041 sweep do I need for a standard 36-inch commercial door?
The 18041 comes in 36, 48, 84, and 96 inch lengths. For a standard 3-0 door, the 36 inch piece is the match and gets cut to the exact door width on site. The 84 and 96 inch lengths are there for wide openings or for cutting down multiple short pieces from one stick. All four lengths are available in every finish and in both brush inserts.
4) What else could I buy instead of the Pemko 18041 brush sweep?
Closest like-for-like in our line is the Cal-Royal BW-302, a nylon brush weatherstrip in an extruded aluminum seal retainer, so it is the same construction: aluminum carrier with a brush insert. Hager's 726S is a different animal, a press-on smoke seal in charcoal that adheres rather than fastening through an extrusion, which is the quick retrofit when you cannot fasten into the door. If you need the jamb rather than the door bottom, the Hager 864S is a clear anodized adjustable jamb weatherstrip in 84 inch. Only the 18041 among these carries a stated UL10C positive pressure fire rating.
5) I need weatherstripping for the door jambs, not the bottom. Is the 18041 the right part?
No. The 18041 is a door bottom sweep, an aluminum retainer that fastens along the bottom rail of the door with a brush riding on the threshold or floor. It does not do the jamb or head. For the frame perimeter, look at an adjustable jamb weatherstrip such as the Hager 864S, an 84 inch clear anodized unit with a neoprene insert. On a full rated opening you typically need both: perimeter gasketing at head and jambs plus a sweep at the bottom.
6) Should I use a brush sweep or a neoprene weatherstrip for smoke and draft control at the door?
They seal differently. The Pemko 18041 uses a 3/4 inch nylon brush insert in an aluminum retainer, which sweeps across a floor or threshold as the door swings and tolerates an uneven surface. The Hager 862S and Hager 864S use a neoprene insert instead - the 862S is a 48 inch weatherstrip for smoke and draft control, and the 864S is an 84 inch clear anodized aluminum adjustable jamb weatherstrip. A compressible neoprene bulb wants a consistent, flat contact surface to seal against; brush filaments will conform to a floor that is not flat. Choose by where the seal lands and how true that surface is.
7) What is the closest equivalent to the Pemko 18041 door bottom from another manufacturer?
The nearest match is the Cal-Royal BW-302, a nylon brush weatherstrip built on an extruded aluminum seal retainer - the same construction idea as the Pemko 18041, which pairs an aluminum retainer with a replaceable nylon brush insert. Where the two part company is the certification record: the 18041 is BHMA certified, fire rated to UL10C positive pressure, smoke tested to UL1784, and carries UL 4L10 and GREENGUARD Gold. If the opening is a rated fire door assembly and the submittal has to show a listing, specify the 18041 by model number rather than swapping in a generic brush strip.
8) Can I use the Hager 864S in place of a Pemko 18041 door bottom?
No - they go in different places on the opening. The Hager 864S is an adjustable jamb weatherstrip, so it mounts on the frame to seal the head and hinge or strike jambs. The Pemko 18041 is a door bottom sweep, mounted on the bottom of the door leaf to close the gap at the floor. The 864S looks like a substitute because both are clear anodized aluminum with an insert, but ordering one for the other leaves the wrong edge of the opening unsealed. A fully gasketed opening typically needs both a perimeter product and a door bottom.
9) How much does the 18041 retainer stick down off the bottom of the door?
The aluminum retainer profile measures 1-1/8 inches by 1/4 inch. The 1/4 inch dimension is the depth of the extrusion itself against the door face, and the nylon brush insert adds 3/4 inch of brush below that. Check that against your threshold height and the door undercut before you drill, since a surface-applied sweep like this one hangs below the door bottom rather than mortising into it.
10) Nylon brush or soft brush on a door sweep, which should I order?
Both inserts drop into the same 18041 aluminum retainer, so the choice is about the sweeping surface. Nylon brush is the standard commercial filament and is what the 18041 is catalogued with by default. Soft brush is offered as the alternate insert on every finish and every length. Either way, the insert is replaceable, so when the brush wears out from traffic you pull the insert and slide a new one in rather than pulling the whole extrusion off the door.
11) Will the Pemko 18041 sweep match my dark bronze door hardware?
Three finishes are made: clear anodized aluminum, dark bronze anodized aluminum, and black suede powder coat. Dark bronze anodized is the one that reads with 613 or 10B door hardware, clear anodized matches aluminum storefront and 628 trim, and black suede powder coat is the flat black option. Every finish is available in all four lengths and with either brush insert, so you can standardize a whole building on one look.
12) Can I cut the Pemko 18041 down to fit a narrower door?
Yes, it's meant to be trimmed. The aluminum extrusion is cut to the door width and the brush insert is cut separately, then slid into the retainer channel. That is why buying the 84 or 96 inch length can make sense even for narrower doors, you cut multiple pieces from one stick. Order the next length up from your door width, never under, since the sweep should run the full width of the door bottom.
13) Is there a simpler press-on option instead of a screw-applied aluminum retainer?
The Hager 726S is a press-on smoke seal weatherstrip in a charcoal finish, which installs without the extruded retainer that the Pemko 18041 uses. The tradeoff is scope: the 726S is a perimeter smoke seal, while the 18041 is a door bottom carried in an aluminum retainer in clear anodized, dark bronze anodized, and black suede powder coat, in 36, 48, 84, and 96 inch lengths, with a brush insert that can be replaced without pulling the retainer off the door. For a stocked fleet where crews swap worn brush rather than the whole strip, the retainer style is the one to standardize on.
14) I need a 48 inch weatherstrip - how does the Pemko 18041 compare to the Hager 862S at that size?
Both cover a 48 inch opening: the Hager 862S is a 48 inch weatherstrip with a neoprene insert for smoke and draft control, and the Pemko 18041 is stocked in a 48 inch length among 36, 84, and 96 inch. The difference to weigh is the sealing element and the finish choice - the 18041 comes in clear anodized aluminum, dark bronze anodized, and black suede powder coat with either a nylon brush or a soft brush insert, and it carries the UL10C positive pressure fire rating and UL1784 smoke test. If the door is part of a rated assembly and the finish has to match bronze or black hardware elsewhere in the building, that decides it.
15) Is the 18041 sweep rated for commercial traffic or is it a residential part?
Commercial. The 18041 is an extruded aluminum retainer specified for commercial application, and Pemko lists it for office buildings, schools and healthcare, government and municipal work, multi-tenant residential, and industrial and warehouse doors. The aluminum body stays on the door and only the brush insert is consumable, which is what makes it workable for a property manager maintaining a fleet of openings.
How fast can I get the Pemko 18041CNB 36IN 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 18041CNB 36IN come with a warranty?
Absolutely. The Pemko 18041CNB 36IN 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 18041CNB 36IN?
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 18041CNB 36IN from ZenSupply?
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Product Reviews

  • 5
    Pemko 18041 astragal

    Posted by Chris Cloutier on Oct 27th 2025

    Worked as expected

!