Cal-Royal BW-303 Nylon Brush W...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$13.00
Cal-Royal Cal-Royal BW-303 Nylon Brush with Extruded Aluminum Seal Retainer CAL-BW-303

Cal-Royal BW-303 Nylon Brush Weatherstrip with Extruded Aluminum Seal Retainer

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Model: BW-303A-36
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$13.00
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Cal-Royal BW-303 Nylon Brush Weatherstrip with Extruded Aluminum Seal Retainer

The Cal-Royal BW-303 is a durable door weather seal engineered to restrict air, light, smoke, and insects from around the door opening. Featuring a high-quality Nylon Brush encased in an Extruded Aluminum Seal Retainer, this weatherstrip measures 1/4" (6.4mm) in width, 3/4" (19.1mm) profile height, 7/16" (10.3mm) insert height, and 1-3/16" (29.4mm) total height. Suitable for Wood or Hollow Metal doors, it delivers reliable, energy-efficient sealing performance tested to meet or exceed industry standards.

Key Features

  • Precise Sealing Dimensions: 1/4" (6.4mm) width, 3/4" (19.1mm) profile height, 7/16" (10.3mm) insert height, and 1-3/16" (29.4mm) total height for an accurate, consistent fit around the door opening.
  • Heavy-Duty Construction: High-quality Nylon Brush encased in an Extruded Aluminum Seal Retainer provides long-lasting durability for demanding commercial applications.
  • Energy-Efficient Sealing: Restricts air, light, smoke, and insects while preventing heat loss and infiltration of sound, drafts, moisture, and fire around the door opening.
  • Versatile Door Compatibility: Designed for use on Wood or Hollow Metal doors, including in-door sweep, jamb/header gasketing, and split astragal applications.
  • Bottom Gap Sealing: Specifically designed to seal the gap between the bottom of the door and the top of the threshold or floor surface.
  • Adjustable Installation: Punched with slotted holes to allow for precise adjustment during installation.
  • Alternate Rain Drip Option Available: Also offered with a rain drip design (BWR-301) that deflects water for applications requiring additional weather protection.

Technical Specifications

  • Product Group: Door Trim and Accessories
  • Series: Brush Weatherstrips Series
  • Product Subgroup: Astragals, Gaskets and Weatherstripping
  • Product Type: Weatherstripping
  • Subcategory: Gaskets & Weatherstripping
  • Commercial/Residential: Commercial
  • Product Category: Door Trim and Accessories
  • Department: Door Hardware

Typical Applications

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

Why Cal-Royal BW-303?

Cal-Royal weatherstripping products are engineered and tested for durability and reliable performance, combining a high-quality Nylon Brush with an Extruded Aluminum Seal Retainer to meet or exceed industry standards. Built for both Wood and Hollow Metal door applications, the BW-303 delivers dependable, energy-efficient sealing where consistent commercial-grade performance is essential.

Product Specs

Product Group:
Door Trim and Accessories
Series:
Brush Weatherstrips Series
Product Subgroup:
Astragals, Gaskets and Weatherstripping
Product Type:
Weatherstripping
Subcategory:
Gaskets & Weatherstripping
Commercial/Residential:
Commercial
Product Category:
Door Trim and Accessories
Department:
Door Hardware

Cal-Royal BW-303A-36 – Frequently Asked Questions

1) Will the Cal-Royal BW-303 brush weatherstrip fit a standard 36 inch commercial door?
Yes. The BW-303 comes in 36, 48, 84 and 96 inch lengths, so a 36 inch stock piece covers a standard 3-0 door bottom. The 84 and 96 inch lengths are the ones to order for jamb and header runs on a 7-foot or 8-foot opening. The retainer is punched with slotted holes, so you can cut to length and still adjust the seal position when you set it.
2) Can the Cal-Royal BW-303 be used on a hollow metal door, or is it only for wood?
Both. The BW-303 brush weatherstrip is made for wood and hollow metal doors, and it is a commercial-grade item, not a residential sweep. The mounting is through slotted holes in the extruded aluminum retainer, so it screws to either a wood stile or a hollow metal face.
3) How much gap will a BW-303 brush sweep close at the bottom of a door?
The BW-303 carries a 1/4 inch (6.4mm) wide retainer with a 3/4 inch (19.1mm) profile height, a 7/16 inch (10.3mm) insert height, and 1-3/16 inch (29.4mm) overall height. The overall figure is what matters at the door bottom: the aluminum retainer sits against the door face and the nylon brush hangs below it to bridge the space down to the threshold or finished floor. Measure your existing undercut before ordering, because the brush needs light contact, not compression, to sweep properly.
4) Do I need a door bottom sweep or jamb gasketing for my opening, and can the BW-303 do both?
The BW-303 works in three places: as an in-door sweep at the bottom, as jamb and header gasketing around the frame, and as a split astragal on a pair of doors. That is why the longer 84 and 96 inch pieces exist alongside the 36 and 48 inch door-bottom sizes. For a full perimeter seal on one leaf, plan on a short piece across the bottom and long pieces up both jambs and across the head.
5) Is the Cal-Royal BW-303 brush weatherstrip fire rated?
Use the BW-303 where you need to restrict air, light, smoke and insects on a standard commercial opening. If your door is a labeled fire door and the submittal calls for a fire-rated gasket, specify a product carrying that rating instead, such as the Pemko 68 door top weatherstrip with black sponge neoprene or the Pemko Q103W kerf-in foam seal, both of which are listed as fire rated.
6) What is the difference between the Cal-Royal BW-303 brush weatherstrip and a neoprene-insert weatherstrip like the Hager 862S?
The BW-303 uses a nylon brush held in an extruded aluminum seal retainer, measuring 1/4 inch wide, 3/4 inch profile height, 7/16 inch insert height and 1-3/16 inch total height. The Hager 862S is a 48 inch weatherstrip with a neoprene insert for smoke and draft control. A brush pile sweeps over irregular or dirty floors and uneven thresholds and tolerates high door cycle counts without dragging; a solid neoprene bulb makes contact against a flat, consistent surface. On a door bottom that rides over carpet, tile transitions or an aging threshold, the nylon brush of the BW-303 is the one that keeps contact.
7) I need a seal on a fire-rated door top and head. Is the BW-303 the right part?
The BW-303 is described for use on wood or hollow metal doors in in-door sweep, jamb and header gasketing and split astragal applications, and for sealing the gap between the door bottom and the threshold or floor. Where the job specifically calls for a fire-rated top-of-door seal, the Pemko 68 is a fire-rated door top weatherstrip supplied in 40 inch lengths with a black sponge neoprene insert, and the Pemko Q103W is a kerf-in foam weatherstrip with an extended flange, 1-1/4 inch by 3/16 inch, also fire rated. Match the seal to what the fire door assembly listing on your opening requires.
8) My frame is kerfed. Can I use the Cal-Royal BW-303, or do I need a different gasket?
The BW-303 is a surface-applied part: the nylon brush is carried in an extruded aluminum seal retainer punched with slotted holes so it can be screwed on and adjusted during installation. It is not a kerf-in seal. For a frame already kerfed at the stop, the Pemko Q103W is a kerf-in foam weatherstrip with an extended flange, 1-1/4 inch by 3/16 inch, which presses into the kerf rather than fastening to the face of the stop.
9) Should I use a nylon brush seal or a neoprene or foam weatherstrip on my doors?
Brush and compression seals solve different problems. The nylon brush in the BW-303 rides over uneven floors and out-swinging thresholds without binding the door, and it sheds grit, which is why it suits warehouse, industrial and high-traffic entries. A compression insert seals tighter against a flat, true surface but drags if the floor is out of level. If a compression seal is what your spec calls for, the Hager 862S and Hager 864S use a neoprene insert, and the Pemko Q103W is a kerf-in foam type with an extended flange.
10) What finishes does the Cal-Royal BW-303 come in, and will it match my existing door hardware?
Two finishes on the extruded aluminum retainer: Aluminum and Duronodic. Aluminum matches clear-anodized storefront and most aluminum frames; Duronodic is the dark bronze tone used on bronze anodized frames and dark painted hollow metal. All four lengths, 36, 48, 84 and 96 inch, are offered in each finish, so a property manager standardizing a building can hold one finish across every opening.
11) Is there a version of this Cal-Royal brush weatherstrip that sheds rain?
Yes. The BW-303 is the plain brush-and-retainer version. If the door is exposed and you need water thrown clear of the opening, Cal-Royal offers the BWR-301, the same brush seal with a rain drip built into the retainer. Pick the drip version for exterior entries under no overhang, and the BW-303 for interior, vestibule, or protected exterior doors.
12) Do I have to drill new holes to install the BW-303, or can I reuse the existing sweep holes?
The aluminum retainer is punched with slotted holes rather than round ones, so there is travel to line up with fasteners already in the door face and to fine-tune brush height against the threshold after the door is hung. On a straight sweep replacement that usually means no new drilling, provided the hole spacing on the old sweep falls within the slots.
13) Is there a simpler option than the BW-303 if I do not want to drill the frame?
The BW-303 mounts with an extruded aluminum retainer punched with slotted holes, which means fastening it to the door or frame. If you want to avoid fasteners, the Hager 726S is a smoke seal weatherstrip with press-on installation in a charcoal finish. The trade-off is construction: the BW-303 gives you a nylon brush in a rigid aluminum retainer available in aluminum and duronodic finishes, where a press-on smoke seal adheres directly to the stop.
14) What should I use on the jamb if I need to adjust the seal after the door is hung?
The BW-303 retainer is punched with slotted holes so the seal position can be fine-tuned at install, and it is suited to jamb and header gasketing on wood or hollow metal doors in 36, 48, 84 and 96 inch lengths. The Hager 864S is an alternative adjustable jamb weatherstrip, 84 inches, in clear anodized aluminum with a neoprene insert. Both let you dial in compression; the difference is brush versus neoprene at the contact point.
15) I need a dark finish to match bronze frames. Does the BW-303 cover that, or do I go to another brand?
The BW-303 is stocked in Duronodic as well as Aluminum, in 36, 48, 84 and 96 inch lengths, so a dark anodized look is available within the same part. Among the alternatives, the Hager 726S smoke seal is a charcoal finish and the Hager 864S is clear anodized aluminum. If the goal is a bronze-tone aluminum retainer at a door bottom or jamb, the Duronodic BW-303 is the direct pick.
16) Exterior door that gets driven rain - is the BW-303 enough, or is there a version with a drip?
The BW-303 seals the gap at the door bottom and around the opening but has no water deflector on the retainer. Cal-Royal offers the same brush seal in a rain drip design as the BWR-301, which deflects water away from the opening. For exterior door tops specifically, the Pemko 68 is a fire-rated door top weatherstrip with a black sponge neoprene insert if the opening also carries a fire label.
17) Will a nylon brush seal hold up on a high-traffic entry in a school or hospital?
That is the intended use. The BW-303 pairs a nylon brush with an extruded aluminum retainer rather than a plastic or vinyl housing, and Cal-Royal lists it for commercial office buildings, schools, healthcare facilities, retail, industrial and warehouse space, multi-tenant residential and government buildings. The aluminum carrier is what survives repeated door strikes and cart traffic; the brush filaments are the wear part and can be replaced by swapping the strip.
How fast can I get the Cal-Royal BW-303A-36 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 Cal-Royal BW-303A-36 come with a warranty?
Absolutely. The Cal-Royal BW-303A-36 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 Cal-Royal BW-303A-36?
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 Cal-Royal BW-303A-36 from ZenSupply?
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