Von Duprin KR4954-8-6 Keyed Re...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,664.00
$1,017.88
Von Duprin KR4954 Keyed Removable Steel Mullion in SP28 Aluminum Painted finish

Von Duprin KR4954-8-6 Keyed Removable Steel Mullion for Rim Exit Devices with Self-Locking Reinstallation

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Model: KR4954 7 FT 6 IN SP313
$1,664.00
$1,017.88
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In Stock (leaves warehouse same day if ordered before 3pm ET)

$1,664.00
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Von Duprin KR4954-8-6 Keyed Removable Steel Mullion for Rim Exit Devices with Self-Locking Reinstallation

Single-Door Performance in Double-Door Openings

The Von Duprin KR4954-8-6 Keyed Removable Steel Mullion is engineered to deliver single-door performance in double-door openings equipped with rim exit devices. Measuring 2" (51 mm) wide and 3" (76 mm) deep with a 1/8" (3 mm) wall thickness, this Grade 1 Commercial mullion is available in an 8'6" height and is constructed for demanding commercial applications. A single operation of the mortise cylinder releases the mullion, allowing large equipment or furniture to pass through freely, while the mullion self-locks upon reinstallation — no cylinder key required. Requires a 1-1/4" mortise cylinder with a straight cam (Schlage cam reference B502-191), sold separately.

Professional Features & Benefits

  • Precise Dimensions: 2" (51 mm) width and 3" (76 mm) depth with a 1/8" (3 mm) wall thickness provide a robust, space-efficient profile suited for commercial double-door openings.
  • Available Heights: Offered in 7'6", 8'6", and 10'6" heights to accommodate a wide range of door frame configurations.
  • Self-Locking Reinstallation: The mullion automatically self-locks when reinstalled, eliminating the need for a cylinder key during re-engagement and streamlining daily operations.
  • Single-Cylinder Release: One operation of the mortise cylinder releases the mullion, enabling unobstructed passage of large equipment or furniture through the opening.
  • Grade 1 Commercial Construction: Rated Grade 1 Commercial for heavy-duty performance in high-traffic commercial environments.
  • Cylinder Compatibility: Requires a 1-1/4" mortise cylinder with a straight cam (Schlage cam reference B502-191); cylinders are sold separately for flexible specification.
  • Strike Prep Options: Available with 299 Strike Prep or No Prep (Blank) to suit various installation requirements; ships with mounting screws and is prepped for strikes (strikes not included unless otherwise indicated).
  • Finish Options: Available in SP28 (Aluminum Painted) and SP313 (Dark Bronze Painted) to complement a variety of architectural aesthetics.

Technical Specifications

  • Product Group: Exit Devices and Trim
  • Series: KR4954
  • Grade: Grade 1
  • Product Subgroup: Parts and Accessories
  • Subcategory: Parts and Accessories
  • Product Type: Exit Devices Parts
  • Commercial/Residential: Commercial
  • Parts and Accessories Type: Installation Accessories
  • Product Attribute: Parts and Accessories
  • Fire Rating: No
  • Product Category: Exit Devices and Trim
  • Department: Door Hardware

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 Von Duprin Quality?

Von Duprin keyed removable steel mullion products are built to Grade 1 Commercial standards, ensuring reliable performance in the most demanding high-traffic environments. The KR4954 series features self-locking reinstallation and single-cylinder release for streamlined daily operation, backed by Von Duprin's reputation for professional-grade door hardware. Engineered for commercial applications where dependable performance and ease of use are essential.

Manufacturer Resources

Von Duprin 98/99 Series Catalog

Product Specs

Maximum Purchase:
5 units
Product Group:
Exit Devices and Trim
Series:
KR4954
Grade:
Grade 1
Product Subgroup:
Parts and Accessories
Subcategory:
Parts and Accessories
Product Type:
Exit Devices Parts
Commercial/Residential:
Commercial
Parts and Accessories Type:
Installation Accessories
Product Attribute:
Parts and Accessories
Fire Rating:
No
Product Category:
Exit Devices and Trim
Department:
Door Hardware

Von Duprin KR4954 7 FT 6 IN SP313 – Frequently Asked Questions

1) Can I use a rim exit device on a pair of doors with no center mullion?
Not directly. Rim devices latch into a strike, so a pair of doors needs something for that strike to sit on. The Von Duprin KR4954 keyed removable steel mullion fills the center of the opening and gives each leaf a rim device to latch into, so you get single-door performance across a double-door opening. When you need the full width clear, one turn of the mortise cylinder releases the mullion and it lifts out. The alternative is switching to vertical rod devices, which latch at the head and threshold and leave the center open permanently.
2) What cylinder do I need to order with the Von Duprin KR4954 mullion?
A 1-1/4 inch mortise cylinder with a straight cam, Schlage cam reference B502-191. It is not included, so it goes on the order separately. Key it into whatever system the building already runs. Only the removal takes a key: once the mullion is set back in the opening it self-locks, so staff putting it back after a delivery do not need a key in hand.
3) What height Von Duprin KR4954 mullion do I need for my frame?
Three heights are made: 7'6", 8'6", and 10'6". Measure the frame opening height, not the door leaf, and take the mullion that spans it. Standard 7-foot commercial frames take the 7'6"; taller storefront and warehouse openings are what the 8'6" and 10'6" are there for. All three come in both finishes and both strike preps.
4) How much of the door opening does a removable steel mullion take up?
The KR4954 mullion is 2 inches (51 mm) wide and 3 inches (76 mm) deep, with a 1/8 inch (3 mm) wall. Subtract the 2 inch width from your clear opening when both leaves are shut, which is why the removable design matters if you ever roll equipment or furniture through. Pull the mullion and you have the full double-door width back.
5) Should I order the KR4954 mullion with 299 strike prep or no prep?
Order the 299 Strike Prep if your rim devices use the Von Duprin 299 strike, which is the usual pairing, and the mullion arrives already machined for it. Choose No Prep (Blank) when the strike is something else, the mounting location is nonstandard, or you want to drill in the field. Either way the mullion ships with mounting screws, and strikes themselves are a separate line item.
6) Can I use the Von Duprin KR4954 mullion on a fire rated pair of doors?
No. The KR4954 is not fire rated, so keep it off any labeled opening. Fire rated pairs need a fire rated mullion, and substituting a non-rated one voids the assembly's label. For non-rated openings in offices, retail, schools, healthcare corridors, warehouses and government buildings, this is the right part.
7) What is the closest steel mullion to the Von Duprin KR4954 for a double-door opening with rim exit devices?
The Falcon 4023 is the direct counterpart. It is a steel mullion built for double-door exit device applications, the same job the Von Duprin KR4954 does in a pair of doors fitted with rim devices. The difference is in how the mullion comes out of the opening: the KR4954 is a keyed removable mullion, released by a single operation of a 1-1/4 inch mortise cylinder with a straight cam and self-locking when reinstalled with no key needed. If your operation is moving equipment or furniture through the opening on a regular basis and you want the removal keyed and the re-engagement toolless, the KR4954 is the one specified for that; if the mullion only comes out rarely or for service, the Falcon 4023 covers the same double-door structural role.
8) Are Falcon 525 mullion stabilizers an alternative to a Von Duprin KR4954 mullion?
No. The Falcon 525 is a set of aluminum mullion stabilizers for exit devices, an accessory that steadies a mullion in the opening. The Von Duprin KR4954 is the mullion itself, a 2 inch wide by 3 inch deep steel section with 1/8 inch wall, supplied in 7 ft 6 in, 8 ft 6 in and 10 ft 6 in heights, that carries the strike for rim exit devices on a pair of doors. Ordering stabilizers when the opening needs a mullion leaves the pair with nothing to latch into. Stabilizers are ordered alongside a mullion, not in place of one.
9) Is the KR4954 mullion heavy duty enough for a high traffic entrance?
It is Grade 1, the heaviest commercial duty rating, in a steel section with a 1/8 inch wall. That is the specification level you want on main entrances, school corridors, and loading areas where the mullion is taken out and put back regularly rather than left alone for years.
10) What is the difference between a keyed removable mullion and a fixed steel mullion?
A fixed mullion stays in the opening permanently. The KR4954 is keyed removable: a single operation of the mortise cylinder frees it so you can carry a desk, a bed, or a pallet through the full opening, and it self-locks when you set it back. Pick removable where wide loads move through, like healthcare, multi-tenant residential, and warehouse doors. If nothing oversized ever passes, a plain steel mullion such as the Falcon 4023 does the same security job for double door exit device openings without the cylinder. Note the KR4954 is not fire rated, so a labeled pair rules it out either way.
11) The rim exit device on a pair of doors will not latch. Is the fix a KR4954 mullion or a latch part?
It depends on which half of the opening moved. If the mullion is missing, damaged, or the wrong height for the frame, the Von Duprin KR4954 keyed removable steel mullion is the part, ordered in the 7 ft 6 in, 8 ft 6 in or 10 ft 6 in height that matches the frame and with either 299 strike prep or no prep (blank). If the mullion is sound and the device itself is not catching, the failure is in the device latching hardware and the replacement is a device-specific component, such as the Accentra 7110/7120 top latch replacement component on an Accentra 7110 or 7120, or the Falcon T Series 2-3/8 inch square corner deadlatch replacement part on a Falcon T Series device. Those parts are tied to a device family and do not interchange with a mullion.
12) Can an Arrow 16RCR-27 SFIC rim housing be used to key a Von Duprin KR4954 removable mullion?
No. The Arrow 16RCR-27 is a small format interchangeable core rim housing in the Arrow 24/25 Series, built to take an SFIC core in a rim exit device. The Von Duprin KR4954 mullion releases on a 1-1/4 inch mortise cylinder with a straight cam, Schlage cam reference B502-191, sold separately. A rim housing and a mortise cylinder are different cylinder formats and are not interchangeable in the mullion. A locksmith keying the mullion into an existing system orders the mortise cylinder in the keyway the facility already runs.
13) What is used instead of a removable mullion when a double-door opening must stay clear with no vertical post?
When the opening cannot carry a post at all, the doors go to concealed vertical rod exit devices, which latch top and bottom into the frame and floor instead of into a mullion. That is a different device on the doors and a different parts list behind it, such as the Falcon 610061 24 Series Monarch concealed vertical top rod for F-25-C and F-25-CWDC exit devices. The Von Duprin KR4954 keyed removable steel mullion takes the other approach: the post stays in place for daily use and comes out on a single cylinder operation when equipment has to pass, then self-locks on reinstallation. Choose the mullion when the opening is clear only occasionally, and vertical rods when it must be clear as its normal condition.
14) What finishes does the Von Duprin KR4954 removable mullion come in?
Two painted finishes: SP28 Aluminum Painted and SP313 Dark Bronze Painted. SP28 is the one that blends into clear anodized aluminum storefront, SP313 into dark bronze frames and dark anodized entrances. Both are offered at all three heights and in both strike prep options, so matching the rest of the entrance does not limit your other choices.
15) My mullion moves too much when the doors slam. What can I add?
Play at the top or bottom of a removable mullion is normally a stabilizer problem, not a mullion problem. Falcon 525 aluminum mullion stabilizers are made for exit device mullions and steady the section at the frame. Worth checking before you replace a mullion that is otherwise sound.
How fast can I get the Von Duprin KR4954 7 FT 6 IN SP313 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 Von Duprin KR4954 7 FT 6 IN SP313 come with a warranty?
Absolutely. The Von Duprin KR4954 7 FT 6 IN SP313 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 Von Duprin KR4954 7 FT 6 IN SP313?
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 Von Duprin KR4954 7 FT 6 IN SP313 from ZenSupply?
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Product Reviews

  • 5
    VonDuprin removable steel mullion

    Posted by Jake Spence on Dec 12th 2025

    It's a big hunk of steel square tube, and it's just what we needed. Always great products from Von Duprin

  • 5
    removable mullion

    Posted by Shane McCoy on Nov 20th 2025

    shipped fast good price

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