Von Duprin 9975-3FT Wide Stile...
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$3,498.40
Von Duprin 9975 Series - 3 ft Grooved Case Wide Stile Mortise Exit Device

Von Duprin 9975-3FT Wide Stile Grooved Case Mortise Exit Device for 36" Doors

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Model: 9975EO 3 US26D
$3,498.40
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Von Duprin 9975-3FT Wide Stile Grooved Case Mortise Exit Device for 36" Doors

Heavy-Duty 99 Series Commercial Mortise Exit Device for Institutional Applications

The Von Duprin 9975-3FT is a professional-grade wide stile mortise exit device from the renowned 98/99 Series, engineered for demanding institutional environments including schools, hospitals, and government buildings. Featuring the distinctive grooved mechanism case of the 99 Series, this device is designed for 36" doors with a door thickness of 1-3/4" and accommodates wide stile construction. The 9975-3FT is certified to ANSI/BHMA A156.3 2014 Grade 1 standards and is UL listed for panic exit hardware, delivering the highest level of code-compliant performance for single and double door applications with mullion. Fasteners are included for wood or metal doors 1-3/4" and 2-1/4" thick, and the device ships as non-handed for straightforward installation flexibility.

Professional Features & Benefits

  • Wide Stile Grooved Case Design: The 99 Series grooved mechanism case distinguishes this device architecturally while providing heavy-duty push pad performance suited for high-traffic institutional applications.
  • Door Size & Thickness Compatibility: Engineered for 36" doors with a door thickness of 1-3/4", with a center case measuring 8" x 2-3/4" x 2-3/8" and a product projection of 3-13/16" for precise fit in wide stile applications.
  • Mortise Latch Performance: Features a 3/4" latch throw for reliable latching and secure door retention in commercial mortise exit device configurations.
  • Non-Handed Configuration: Ships as non-handed for versatile installation, except when specific device options such as SD (special dogging), -2 (Double Cylinder), or SS (signal switch) are selected.
  • Hex Key Dogging: Equipped with hex key dogging for convenient hold-open functionality, allowing facility managers to secure the device in the retracted position as needed.
  • 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 compliance. Fire-rated configurations also meet ANSI/UL 10C and CAN/ULC-S104 requirements.
  • Field-Configurable & Retrofit-Ready: 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.
  • Fasteners Included: Comes complete with fasteners for wood or metal doors 1-3/4" and 2-1/4" thick, simplifying installation across common door types.
  • Covers Standard Door Cutouts: Compatible with stock hollow metal doors featuring 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: 9975-3ft
  • Door Hand Direction: Non-Handed
  • Door Thickness Range: 1-3/4"
  • Product Size: 36"
  • Dogging Configuration: Hex Key Dogging
  • Fire Rating: No
  • Product Projection: 3-13/16"
  • Product Style: Push Pads
  • Product Category: Exit Devices and Trim
  • Department: Door Hardware

Professional Applications

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

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 are UL listed for panic exit hardware, ensuring code-compliant performance in the most demanding institutional environments. The 9975-3FT features a heavy-duty wide stile push pad design with a grooved mechanism case, built to withstand high use and abuse in schools, hospitals, and government facilities. With a broad range of field-configurable options, retrofit kits, and compatible accessories, Von Duprin delivers the flexibility and long-term reliability that commercial door hardware professionals depend on.

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:
9975-3ft
Door Hand Direction:
Non-Handed
Door Thickness Range:
1-3/4"
Product Size:
36"
Dogging Configuration:
Hex Key Dogging
Fire Rating:
No
Product Projection:
3-13/16"
Product Style:
Push Pads
Product Category:
Exit Devices and Trim
Department:
Door Hardware

Von Duprin 9975EO 3 US26D – Frequently Asked Questions

1) What door size and thickness does the Von Duprin 9975-3FT fit?
It's built for a 36 inch door leaf at 1-3/4 inches thick, single thickness only. The device projects 3-13/16 inches off the door face once mounted, and the center case measures 8 x 2-3/4 x 2-3/8 inches. That projection matters where the door swings into a corridor or against a wall with limited clearance. It is a wide stile device, so it needs a stile deep enough to take that center case.
2) Do I need to specify handing on the Von Duprin 9975 mortise exit device?
Yes, handing is an order choice: RHR (right hand reverse) or LHR (left hand reverse). The device itself ships non-handed except when certain options are on the order, specifically SD special dogging, -2 double cylinder, or SS signal switch. Pick those and the device becomes handed, so the hand has to be right the first time. All exit devices are reverse bevel by nature, which is why the only two choices are RHR and LHR.
3) Will the Von Duprin 9975 cover the existing cutouts on my hollow metal door?
On single doors, yes for stock hollow metal doors with 86 or 161 cutouts, which is the usual prep on a commercial opening. On pairs it may cover the cutouts, but that one needs the template checked against the actual door before you commit. A 161 prep is the standard cylindrical lock prep and 86 is the mortise lock prep, so this is a common retrofit path off an old mortise lockset.
4) What trim functions can I order with the Von Duprin 9975 exit device?
Thirteen trim functions are available: exit only (EO), night latch (NL), knob (K), knob with blank escutcheon, knob dummy trim, knob night latch, lever (L), lever with blank escutcheon, lever dummy trim, lever night latch, thumbpiece (TP), thumbpiece with blank escutcheon, and dummy trim (DT). Choose exit only where nothing outside should open the door, night latch where a key retracts the latch for entry, and a lever or knob function where staff need normal outside access. If you pick an L lever function, you also choose the lever design: 06 is the default, with 01, 02, 03, 05, 07, 17 and 18 also offered.
5) Can the Von Duprin 9975 be tied into an access control system?
Yes. Order it with QEL quiet electric latch retraction, EL electric latch retraction, or PN pneumatic to pull the latch under signal from a card reader or remote release. For monitoring, RX request-to-exit signals when the pad is pushed and LX monitors latchbolt position; LX-RX combines both. Also available are WP-RX waterproof RX, RX-LC low current RX, RX-2 double RX, and SS signal switch. These are field configurable on the 98/99 platform, so an existing device can be retrofitted rather than replaced.
6) Is the Von Duprin 9975 exit device ANSI Grade 1 and panic listed?
Grade 1 to ANSI/BHMA A156.3 2014, and UL listed for panic exit hardware under ANSI/UL 305 and CAN/ULC-S132. That is the certification set a school, hospital, or government facility spec normally calls for on an egress door. Grade 1 is the highest of the three ANSI durability grades for exit devices.
7) The opening needs a fire rated mortise exit device - what should I use instead of the Von Duprin 9975-3FT?
The 9975-3FT is a non fire rated mortise exit device. For a fire rated opening, the Adams Rite 3300 Series is a Grade 1 wide stile fire rated mortise exit device for wood and hollow metal doors, and the Corbin Russwin ED5600AL is a Grade 1 3 hour fire rated wide stile mortise exit device for 1-3/4 inch doors. Both carry the same Grade 1 certification as the 9975-3FT, so the swap does not cost you grade - it changes the listing you can put on a labeled door.
8) Can I put the Von Duprin 9975-3FT on a narrow stile aluminum storefront door?
No. The 9975-3FT is a wide stile device with an 8 inch by 2-3/4 inch by 2-3/8 inch center case, sized for wide stile construction. For a narrow stile aluminum door, the Adams Rite 8400 Series is a Grade 1 narrow stile mortise exit device built for aluminum doors. The Sargent 8304 is another Grade 1 narrow stile mortise device, in night latch function. Ordering the 9975 for a storefront stile is the most common mis-buy in this family.
9) What is a wide stile mortise exit device equivalent to the Von Duprin 9975-3FT from another manufacturer?
The Falcon 25-M-EO is the closest straight equivalent: a 36 inch wide stile mortise exit device, ANSI/BHMA Grade 1, for 1-3/4 inch doors, matching the 9975-3FT on stile type, door thickness and grade. The difference is function scope. The Falcon 25-M-EO is exit only, so the outside of the door has no trim operation. The 9975-3FT is ordered across a full trim range including lever, knob, thumbpiece, night latch and dummy trim, so if the opening needs outside entry the Von Duprin covers it in one order and the Falcon does not.
10) Should I use a mortise exit device or a rim device on my opening?
A mortise device like the 9975 latches into a mortise pocket cut into the door edge, which gives a concealed latch and a cleaner look, but the door has to be prepped for it. It handles a single door or a pair with a mullion. It won't work on a pair without a mullion, where you need vertical rods latching at head and threshold instead. For that condition ZenSupply carries the Sargent 1256NB-8710G, an 84 inch surface vertical rod device. The mortise route is the one to take when the door edge is already mortise prepped or the drawing calls for concealed latching.
11) Will the 3/4 inch latch throw on the Von Duprin 9975 engage my existing strike?
The mortise latch throws 3/4 inch, which is the full engagement depth you need in the strike pocket. If the frame is already prepped for a standard commercial mortise lock strike, the throw depth works. What actually decides it is strike location and the mortise pocket in the door edge, not the throw itself, so confirm the frame prep lines up with the device template.
12) How do I hold the Von Duprin 9975 pushbar dogged down during business hours?
Hex key dogging is standard, so a facility tech holds the pad retracted with an allen wrench. On the order you can swap that for CD cylinder dogging (keyed, so only keyholders can dog it), CDSI cylinder dogging with a security indicator, HDSI hex dogging with an indicator, SD special center case dogging, DI dogging indicator, CI cylinder dogging indicator, or LD less dogging where the door must never be held unlatched. Note that SD makes the device handed.
13) What is the difference between the Von Duprin 9975 and the Falcon 25-M mortise exit device?
Both are Grade 1 wide stile mortise devices for a 36 inch, 1-3/4 inch thick door. The Falcon 25-M-EO is exit only, meaning no outside trim function at all, so it suits a stairwell or rear exit where nobody needs to come back in. The 9975 is ordered in any of thirteen trim functions including night latch, lever, knob, and thumbpiece, plus electric latch retraction and switch options. If the opening only ever needs push-to-exit, the Falcon covers it; if outside access or access control is in play, the 9975 is the one that configures for it.
14) I only need exit from the inside - is there a simpler alternative to the Von Duprin 9975-3FT?
Yes. The 9975-3FT can be ordered EO exit only, but if the opening will never take outside trim, a dedicated exit only device is a simpler order. The BEST Precision 2301 Series is an exit only mortise exit device with heavy wrought construction, the Detex 30 Series Advantex is a Grade 1 wide stile mortise device supplied device only exit only, and the Falcon 25-M-EO is a Grade 1 exit only wide stile mortise device for 1-3/4 inch doors. Note the Detex 30 Series, like the 9975-3FT, is not rated for wood doors.
15) Which mortise exit device should I use for access control with electric latch retraction?
The Von Duprin 9975-3FT takes EL electric latch retraction or QEL quiet electric latch retraction as an ordered option, alongside RX request to exit and LX latchbolt monitor switches, on the same wide stile mortise device for 1-3/4 inch doors. If the opening is a narrow stile fire rated door instead, the Sargent 1256NB-8710G is a Grade 1 surface mount vertical rod device supplied with electric latch retraction. The Sargent 8904 is a wide stile Grade 1 night latch mortise device with 24VAC/DC operation.
16) What is the closest match to a Von Duprin 9975-3FT in night latch function?
The 9975-3FT is ordered in NL night latch and L-NL or K-NL lever and knob night latch trim functions on the same wide stile mortise device. Among other makes, the Sargent 8904 is a Grade 1 wide stile mortise exit device in night latch function with 24VAC/DC operation, and the Sargent 8304 is the Grade 1 narrow stile night latch equivalent. Pick by stile: the 8904 lands on the same wide stile openings as the 9975-3FT, the 8304 does not.
17) I need a matching non-functioning pull on the inactive leaf - is the Sargent 810 a substitute for a Von Duprin 9975-3FT?
No. The Sargent 810 is dummy function exit device trim, a pull only, with no latching mechanism. The 9975-3FT is a full panic exit device with a 3/4 inch latch throw and hex key dogging. If you want the dummy look on the same device family, the 9975-3FT is ordered in DT dummy trim, L-DT and K-DT trim functions. Use the 810 only where a trim-only pull is wanted, not where a code required egress device is called for.
18) Which mortise exit devices come with lever trim and which need it ordered separately?
The Von Duprin 9975-3FT is ordered with the trim function built into the selection, including L lever, L-BE lever with blank escutcheon and L-NL lever night latch, with the lever design chosen from 01, 02, 03, 05, 06, 07, 17 and 18. The Corbin Russwin ED5600AL is supplied exit only or for use with classroom or passage lever trim that is not included, so the trim is a separate line. The Falcon 25-M-EO and the BEST Precision 2301 are exit only devices. That difference decides whether you are placing one line or two for a complete opening.
19) We are standardizing Grade 1 mortise exit devices across a facility - which options match on grade?
On ANSI/BHMA Grade 1, the Von Duprin 9975-3FT is matched by the Adams Rite 3300 and 8300 Series, the Adams Rite 8400, the Corbin Russwin ED5600AL, the Detex 30 Series Advantex, the Falcon 25-M-EO and the Sargent 8904 and 8304. Grade alone will not standardize a facility, though: split them by stile, since the 9975-3FT, the Adams Rite 3300 and 8300, the Corbin Russwin ED5600AL, the Detex 30 and the Falcon 25-M-EO are wide stile, while the Adams Rite 8400 and Sargent 8304 are narrow stile, and split again by fire rating, where the Adams Rite 3300 and the Corbin Russwin ED5600AL are the fire rated members of the group.
20) What are the Von Duprin 9975 exit device finish options for matching the rest of my building?
Twelve finishes cover most standardization jobs: 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. On institutional openings 626 satin chrome and 630 satin stainless are the usual fleet standards, and 628 aluminum matches clear anodized storefront.
21) Is the Von Duprin 9975 the grooved case or smooth case device?
Grooved. The 9975 belongs to the 99 half of the 98/99 platform, and the grooved mechanism case is what visually separates a 99 from the smooth-case 98. Mechanically they are the same platform, so this is the one to order when the other devices in the building already have the grooved case and you want the fleet to match.
How fast can I get the Von Duprin 9975EO 3 US26D 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 9975EO 3 US26D come with a warranty?
Absolutely. The Von Duprin 9975EO 3 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 3 US26D?
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 9975EO 3 US26D from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.

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