Von Duprin 9975F-4FT Fire Rate...
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$3,278.00
$2,294.60
Von Duprin 9975-F Series - Fire Rated 4 ft Grooved Case Wide Stile Mortise Exit Device, Less Dogging

Von Duprin 9975F-4FT Fire Rated 48" Wide Stile Mortise Exit Device, Less Dogging

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Model: 9975EO-F 4 US26D
$3,278.00
$2,294.60
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Von Duprin 9975F-4FT Fire Rated 48" Wide Stile Mortise Exit Device, Less Dogging

Heavy-Duty Commercial Mortise Exit Device with Fire Rating for Institutional Applications

The Von Duprin 9975F-4FT is a fire rated, wide stile mortise exit device from the renowned 98/99 Series, engineered for demanding institutional environments including schools, hospitals, and government buildings. Featuring a grooved mechanism case and a 48" product size, this device is certified to ANSI/BHMA A156.3 2014 Grade 1 standards and listed to ANSI/UL 10C for fire-rated applications. Designed for single and double doors with mullion, the 9975F-4FT accommodates door thicknesses of 1-3/4" and includes fasteners for both wood and metal doors of 1-3/4" and 2-1/4" thickness. The device is non-handed and configured Less Dogging, with a 3/4" latch throw and a center case measuring 8" x 2-3/4" x 2-3/8", making it a versatile and code-compliant solution for commercial exit applications.

Professional Features & Benefits

  • Fire Rated Certification: Listed to ANSI/UL 10C and CAN/ULC-S104 for fire-rated applications, ensuring compliance with fire and life safety codes in commercial and institutional facilities.
  • ANSI/BHMA Grade 1 Certified: Certified to ANSI/BHMA A156.3 2014 Grade 1, the highest industry standard, along with ANSI/UL 305 and CAN/ULC-S132 for comprehensive code compliance.
  • Wide Stile Grooved Case Design: The 99 Series features a distinctive grooved mechanism case with heavy-duty wide stile push pads, purpose-built for high-use and high-abuse institutional applications.
  • Precise Dimensional Specifications: 48" product size with a center case of 8" x 2-3/4" x 2-3/8", a 3/4" latch throw, and a product projection of 3-13/16" for reliable mortise lock integration.
  • Fastener Compatibility: Includes fasteners for wood or metal doors 1-3/4" and 2-1/4" thick, supporting a wide range of commercial door configurations.
  • Non-Handed Configuration: The device is non-handed (except when specific options such as SD, -2, or SS are applied), simplifying specification and installation across varied openings.
  • Field-Configurable Options: A broad range of field-configurable options and retrofit kits are available, including CDSI/HDSI security dogging indicators, QEL electronic latch retraction, and electronic switches (RX request to exit, LX latchbolt monitoring) for access control integration.
  • Upgrade and Retrofit Ready: Compatible with AX (ADA-certified, meets 5 lb. force requirements per 2010 ADA Chapters 404.2.7 and 30934 and 2013 California Building Code Chapter 11B-309.4), CX (CHEXIT delayed egress, meets NFPA and IBC requirements, 15-second delay), and XP (patented 2-piece latchbolt design) upgrade options.
  • Covers Standard Door Cutouts: Compatible with 86 or 161 cutouts on single doors and may cover cutouts on pairs (consult template for pairs applications).

Technical Specifications

  • Series: 98 & 99 Series
  • Grade: Grade 1
  • Fasteners: Included for wood or metal doors 1-3/4" and 2-1/4" thick
  • Product Group: Exit Devices and Trim
  • Product Subgroup: Exit Devices - Mortise
  • Product Type: Exit Devices - Mortise
  • Subcategory: Mortise Exit Devices
  • Latch Throw: 3/4"
  • Commercial/Residential: Commercial
  • Stile Type: Wide Stile
  • Center Case Dimensions: 8" x 2-3/4" x 2-3/8"
  • Wood Door Compatible: No
  • MAP Policy: Yes
  • Product Model: 9975-4ft
  • Door Hand Direction: Non-Handed
  • Door Thickness Range: 1-3/4"
  • Product Size: 48"
  • Dogging Configuration: Less Dogging
  • Fire Rating: Yes
  • Product Projection: 3-13/16"
  • Product Style: Push Pads
  • Product Category: Exit Devices and Trim
  • Department: Door Hardware

Professional Applications

  • Public and Private Educational Facilities (Schools and Universities)
  • Healthcare Institutions and Hospitals
  • Government and Municipal Buildings
  • Commercial Office Buildings
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential and Mixed-Use Properties
  • Retail and Institutional Establishments Requiring Fire-Rated Egress Compliance

Delayed Egress Compliance

The 9975F-4FT is compatible with the CX (CHEXIT) delayed egress upgrade, which meets NFPA and IBC requirements for delayed egress applications. When configured with CHEXIT, the device keeps doors secure for 15 seconds after a request to exit while a nuisance alarm sounds, providing code-compliant delayed egress functionality for facilities requiring controlled exit management.

Why Choose Von Duprin Quality?

Von Duprin 98/99 Series mortise exit devices are certified to ANSI/BHMA A156.3 2014 Grade 1, the highest industry standard, and listed to ANSI/UL 10C and CAN/ULC-S104 for fire-rated performance. The 9975F-4FT features a heavy-duty grooved mechanism case with wide stile push pads, engineered specifically for high-use and high-abuse institutional environments such as schools, hospitals, and government facilities. With a broad range of field-configurable options, retrofit kits, and upgrade paths, Von Duprin exit devices deliver the flexibility and dependability that commercial door hardware professionals demand.

Manufacturer Resources

Von Duprin 98/99 Series Catalog

Product Specs

Series:
98 & 99 Series
Grade:
Grade 1
Fasteners:
Included for wood or metal doors 1-3/4" and 2-1/4" thick
Product Group:
Exit Devices and Trim
Product Subgroup:
Exit Devices - Mortise
Product Type:
Exit Devices - Mortise
Subcategory:
Mortise Exit Devices
Latch Throw:
3/4"
Commercial/Residential:
Commercial
Stile Type:
Wide Stile
Center Case Dimensions:
8" x 2-3/4" x 2-3/8"
Wood Door Compatible:
No
MAP Policy:
Yes
Product Model:
9975-4ft
Door Hand Direction:
Non-Handed
Door Thickness Range:
1-3/4"
Product Size:
48"
Dogging Configuration:
Less Dogging
Fire Rating:
Yes
Product Projection:
3-13/16"
Product Style:
Push Pads
Product Category:
Exit Devices and Trim
Department:
Door Hardware

Von Duprin 9975EO-F 4 US26D – Frequently Asked Questions

1) Can I put the Von Duprin 9975F on a wood door?
No. The 9975F-4FT is not rated for wood door application even though the fastener pack covers wood and metal. For a fire rated mortise device that is stated for both wood and hollow metal doors, the Adams Rite 3300 Series is the one to look at, also Grade 1 wide stile and fire rated.
2) Is the Von Duprin 9975F fire rated for a labeled opening?
Fire rated, listed to ANSI/UL 10C and CAN/ULC-S104. That is also why it comes Less Dogging: a fire rated device cannot be held in a dogged, latch-retracted state. If you want to dog the device open during business hours, you need a non-fire-rated exit device on a non-labeled opening instead.
3) Do I have to specify handing on the Von Duprin 9975F?
The device itself is non-handed, but you still pick a hand when ordering, either RHR (right hand reverse) or LHR (left hand reverse). Handing is also required once options like SD, -2 or SS are applied. If you are ordering the SS signal switch, get the hand right.
4) Will the 9975F cover the existing exit device cutout on my door?
On single doors it covers 86 or 161 cutouts, which is what you usually find when you are pulling an old device off a hollow metal door. On pairs it may cover the cutouts, and the template is what settles it. The 4 foot device with a 3-13/16 inch projection replaces most standard-width openings without new prep.
5) What size door does the 4 foot Von Duprin 9975F cover, and can I use it on a pair?
The 9975F-4FT is a 48 inch device sized for door widths up to roughly 4 feet. It is specified for single doors and for double doors used with a mullion. Because a mortise device latches into the frame at the lock edge, a pair of doors needs a mullion for the inactive leaf to latch against, unlike a surface vertical rod device such as the Sargent 1256NB-8710G, which latches top and bottom and handles a pair without one.
6) Will the Von Duprin 9975F latch into my existing mortise strike?
The device carries a 3/4 inch latch throw, which is the normal mortise engagement for a commercial frame strike. If your frame already has a mortise lock strike prep from a 98/99 Series or comparable Grade 1 mortise device, the throw and the 3-13/16 inch projection are what to check against your frame reveal. Anything cut for a rim strike on the stop will not work; a mortise device latches into the jaw of the frame.
7) Does the Von Duprin 9975F meet ADA 5 pound push force?
Only with the AX option, which is ADA certified to the 5 lb. force requirements of 2010 ADA Chapters 404.2.7 and 30934 and 2013 California Building Code Chapter 11B-309.4. AX is an order-time selection, yes or no, so if the opening is on an accessible route, specify it up front rather than trying to add it later.
8) How do I tie a Von Duprin 9975F into an access control system?
Two ways, and they do different jobs. Switches monitor: RX request to exit, LX latchbolt monitor, LX-RX combined, WP-RX waterproof, RX-LC low current, RX-2 double RX, SS signal switch, plus ALK, RX-ALK and LXRX-ALK alarm kits. Latch retraction actually pulls the latch: EL electric, QEL quiet electric, or PN pneumatic. If you want the door to free-wheel on a card read, you need EL or QEL, not a switch. Note that dogging is not an option here, so electric latch retraction is how you get a push-pull condition on this fire rated device.
9) Which mortise exit devices can go on a wood door if the Von Duprin 9975F cannot?
The Von Duprin 9975F-4FT is not wood door compatible, though its fasteners are supplied for wood or metal doors 1-3/4 inch and 2-1/4 inch thick. The Adams Rite 3300 Series is a fire rated Grade 1 wide stile mortise exit device made for wood and hollow metal doors, and the Adams Rite 8300 Series covers wood and hollow metal on non-fire-rated life-safety openings. The Detex 30 Series Advantex, like the Von Duprin, is not wood door compatible.
10) What mortise exit device should I use on a narrow stile aluminum storefront door instead of a Von Duprin 9975F?
The 9975F-4FT is a wide stile device with a 48 inch product size and an 8 inch by 2-3/4 inch by 2-3/8 inch center case, which needs more stile face than a narrow aluminum door offers. For narrow stile aluminum, the Adams Rite 8400 Series is a Grade 1 narrow stile mortise exit device built for aluminum doors; it is a life-safety device with no fire rating, so it suits non-fire-rated storefront openings. The Sargent 8304 is another narrow stile mortise device, Grade 1, in night latch function.
11) What is the closest fire rated mortise exit device to a Von Duprin 9975F for a wide stile door?
The Corbin Russwin ED5600AL is the nearest equivalent: it is a Grade 1, 3 hour fire rated mortise exit device with a wide stile body and a 1-3/4 inch door thickness range, matching the 9975F-4FT on grade, fire rating, stile type and door thickness. The difference is in trim: the ED5600AL is furnished exit only or for use with classroom or passage lever trim that is not included, while the Von Duprin is ordered with the trim function built into the device call-out, including EO, NL, L, K and TP. The Adams Rite 3300 Series is the other fire rated wide stile mortise option, Grade 1, and it is built for wood and hollow metal doors.
12) Can I use an Adams Rite 8300 mortise exit device on a fire rated opening?
No. The Adams Rite 8300 Series is a life-safety wide stile mortise exit device with a Grade 1 rating, but it carries no fire rating, so it belongs on non-fire-rated egress openings only. For a fire door, stay with a fire rated device such as the Von Duprin 9975F-4FT, which is Grade 1 and fire rated, or the Adams Rite 3300 Series, which is the fire rated wide stile mortise device in the Adams Rite line. The 8300 and 3300 look closely related and are easy to confuse when specifying.
13) Is the Von Duprin 9975F tough enough for a high school corridor?
That is exactly what it is built for. Certified to ANSI/BHMA A156.3 2014 Grade 1 and listed to ANSI/UL 305 and CAN/ULC-S132, with the 99 Series grooved mechanism case and heavy duty wide stile push pads intended for high-use and high-abuse institutional openings such as schools, hospitals and government buildings.
14) I need delayed egress on a fire rated exit door. Can the 9975F do it?
With the CX CHEXIT upgrade, yes. It holds the door secure for 15 seconds after a request to exit while a nuisance alarm sounds, and meets NFPA and IBC delayed egress requirements. The base 9975F-4FT is a standard fire rated mortise device; CX is the upgrade path that adds the delay.
15) What is the difference between a mortise exit device like the 9975F and a rim or vertical rod device?
A mortise exit device puts the lock body into the edge of the door and latches into the frame jamb, so it needs a mortise pocket prepped in the door and, on a pair, a mullion. A rim device surface mounts and latches to a strike on the stop, simpler to install on a retrofit. A surface vertical rod device latches at the head and the threshold, which is how you secure a pair with no mullion at all, like the Sargent 1256NB-8710G. Choose mortise when you want the security of a frame-engaged latch and the door is already prepped for it.
16) I only need a 3 foot mortise exit device, not a 4 foot. What are my options?
The 9975F-4FT is the 48 inch length. For a narrower opening, the Falcon 25-M-EO is a 36 inch wide stile mortise device in exit only function for 1-3/4 inch doors, Grade 1. Exit only means no outside trim, so if you need keyed or lever entry from the pull side that is not the one.
17) Does ordering the Von Duprin 9975F include the outside trim and lever?
Trim function is part of the order on the 9975F, so a K, L or TP selection brings the outside trim with the device and an L selection also carries a lever design. That is different from something like the Corbin Russwin ED5600AL, where the classroom or passage lever trim is not included and gets ordered separately. If you want no outside trim at all, select EO exit only.
18) Can I upgrade an existing Von Duprin 98/99 device instead of replacing it?
The 98/99 Series takes a range of field-configurable options and retrofit kits, including CDSI and HDSI security dogging indicators, QEL quiet electric latch retraction, and RX and LX switches for access control. XP is the patented 2-piece latchbolt upgrade. So an existing 99 Series opening can often gain monitoring or electric latch retraction without pulling the whole device.
19) If I only need exit only with no outside trim, is there a simpler mortise exit device than the 9975F?
Yes. The Falcon 25-M-EO is a Grade 1 wide stile mortise exit device furnished in exit only function for a 36 inch door, and the BEST Precision 2301 Series is an exit only mortise device with heavy wrought construction. The Detex 30 Series Advantex is also supplied device only, exit only, Grade 1 wide stile, and is not wood door compatible. The Von Duprin 9975F-4FT covers exit only as one of its trim functions alongside night latch, lever, knob and thumbpiece, so it is the one to order when the same opening may later need outside trim.
20) Will a Sargent 1256NB-8710G work in place of a Von Duprin 9975F mortise exit device?
No, they are different device types. The Sargent 1256NB-8710G is an 84 inch fire rated surface mount vertical rod exit device with electric latch retraction, Grade 1, narrow stile, so it latches top and bottom through rods rather than into a mortise lock body in the door edge. The Von Duprin 9975F-4FT is a wide stile mortise device with a 3/4 inch latch throw and a 3-13/16 inch projection that works with the mortise prep in the door. Swapping between the two changes the door prep and the frame strike entirely.
21) Is the Sargent 810 a substitute for a Von Duprin 9975F-DT?
No. The Sargent 810 is exit device trim, a Grade 1 dummy pull from the PE80 Series, not a device. It mounts on the inactive or pull side and has no latching mechanism. The Von Duprin 9975F-4FT ordered with DT dummy trim is still a complete 48 inch fire rated mortise exit device; the dummy trim is the outside pull on it. If the opening needs a functioning fire rated exit device, the 810 will not carry that duty.
22) What finishes does the Von Duprin 9975F come in for matching the rest of my building?
Twelve finishes, so matching an existing run of openings is usually straightforward: 605 bright brass, 606 satin brass, 612 satin bronze, 613 oil rubbed bronze, 619 satin nickel, 625 bright chrome, 626 satin chrome, 628 aluminum, 630 satin stainless steel, 643E aged bronze, 710 dark bronze anodized and 711 flat black. In institutional corridors 626 and 630 are the common specs.
23) What are the push bar options on the Von Duprin 9975F?
Five bar choices: standard bar, BR braille push bar, KN knurled bar, RSS emergency exit push bar and SG safety glow. Knurled is the tactile warning bar used where a door leads somewhere hazardous, and safety glow helps locate the bar in a smoke or power-loss condition. There is also a QM quiet mechanical option if the opening is next to occupied space and the latch noise matters.
How fast can I get the Von Duprin 9975EO-F 4 US26D delivered?
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Does the Von Duprin 9975EO-F 4 US26D come with a warranty?
Absolutely. The Von Duprin 9975EO-F 4 US26D 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 9975EO-F 4 US26D?
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