Von Duprin 9975-4FT 4 ft Groov...
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$3,518.00
Von Duprin 9975 Series - 4 ft Grooved Case Wide Stile Mortise Exit Device

Von Duprin 9975-4FT 4 ft Grooved Case Wide Stile Mortise Exit Device with Hex Key Dogging

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Model: 9975EO 4 US26D
$3,518.00
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Von Duprin 9975-4FT 4 ft Grooved Case Wide Stile Mortise Exit Device with Hex Key Dogging

Heavy-Duty Commercial Mortise Exit Device for Institutional and High-Traffic Applications

The Von Duprin 9975-4FT is a 4-foot (48") wide stile mortise exit device from the renowned 98/99 Series, engineered for demanding institutional environments including schools, hospitals, and government buildings. Featuring a distinctive grooved mechanism case, this heavy-duty push pad device is certified to ANSI/BHMA A156.3 2014 Grade 1 standards and listed under ANSI/UL 305 and CAN/ULC-S132, ensuring compliance with the most rigorous industry requirements. Designed for use on single and double doors with mullion, the 9975-4FT accommodates 1-3/4" door thickness and covers stock hollow metal doors with 86 or 161 cutouts on single doors. The device is non-handed, offering flexible installation across a wide range of commercial openings.

Professional Features & Benefits

  • Wide Stile Heavy-Duty Push Pad: Designed as a wide stile device with a grooved mechanism case, the 99 Series push pad delivers architectural distinction and robust performance for high-use institutional applications.
  • 48" Product Size: The 4-foot (48") case length accommodates wide commercial door openings, making it ideal for high-traffic entryways in institutional and commercial facilities.
  • Door Thickness Compatibility: Designed for 1-3/4" door thickness with fasteners included for wood or metal doors 1-3/4" and 2-1/4" thick, providing versatile installation options across common commercial door types.
  • Precision Latch & Case Dimensions: Features a 3/4" latch throw and a center case measuring 8" x 2-3/4" x 2-3/8", with a product projection of 3-13/16" for reliable latching performance and consistent door clearance.
  • ANSI/BHMA Grade 1 Certified: Certified to ANSI/BHMA A156.3 2014 Grade 1, the highest industry standard for exit devices, along with ANSI/UL 305, ANSI/UL 10C (fire-rated configurations), CAN/ULC-S104 (fire-rated configurations), and CAN/ULC-S132 for comprehensive compliance.
  • Non-Handed Design: The rim device is non-handed (except when SD, -2 Double Cylinder, or SS signal switch options are used), simplifying specification and reducing inventory requirements for facility managers.
  • Hex Key Dogging: Equipped with hex key dogging for convenient hold-open functionality, allowing the latchbolt to be retracted and held for high-traffic periods without requiring a key.
  • Field-Configurable Options & Retrofit Kits: 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 (Request to Exit RX and Latchbolt Monitoring LX) for integration with access control systems.
  • Upgrade Options Available: 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 (15-second delay per NFPA and IBC requirements), and XP patented 2-piece latchbolt design.

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: 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
  • Retail Establishments
  • Industrial and Warehouse Facilities
  • Multi-Tenant Residential Properties

Delayed Egress Compliance

The Von Duprin 9975-4FT is compatible with the CX CHEXIT upgrade option, which meets NFPA and IBC requirements for delayed egress. When configured with CHEXIT, a standard 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 mortise exit devices from the 98/99 Series are certified to ANSI/BHMA A156.3 2014 Grade 1, the highest industry standard, and listed under ANSI/UL 305 and CAN/ULC-S132 for comprehensive compliance across commercial applications. The 9975-4FT features a heavy-duty grooved mechanism case with a 3/4" latch throw and center case dimensions of 8" x 2-3/4" x 2-3/8", engineered for reliable performance in the most demanding institutional environments. With a broad range of field-configurable options, retrofit kits, and upgrade paths, Von Duprin delivers the flexibility and durability that schools, hospitals, and government facilities 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:
9975-4ft
Door Hand Direction:
Non-Handed
Door Thickness Range:
1-3/4"
Product Size:
48"
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 4 US26D – Frequently Asked Questions

1) Is the Von Duprin 9975-4FT fire rated?
No. The 9975-4FT is not a fire rated device. It's certified to ANSI/BHMA A156.3 2014 Grade 1 and listed under ANSI/UL 305 and CAN/ULC-S132, but that's panic hardware listing, not fire door listing. On a labeled fire door assembly you need a fire exit device: the Corbin Russwin ED5600AL is a Grade 1 3 hour fire rated mortise exit device for 1-3/4 inch doors, and the Adams Rite 3300 Series is a fire rated wide stile mortise device.
2) Can a 4 ft Von Duprin 9975 exit device be used on a pair of doors?
Yes, with a mullion. The 9975-4FT is a mortise device, so it latches into the frame or a mullion at the strike jamb only. On a single door it works straight off. On a pair, you need a removable or fixed mullion between the leaves for the latch to engage. If you want a pair with no mullion and a clear opening, that's a vertical rod device instead, not this one.
3) Do I have to specify handing for a Von Duprin 9975 mortise exit device?
Yes for this one. The 98/99 rim device is non-handed, but the 9975 mortise version is ordered RHR (right hand reverse) or LHR (left hand reverse), because the mortise lock case itself is handed. Stand outside the door: if it swings toward you and the hinges are on the right, it's RHR. Handing also becomes a factor on rim devices with SD, -2 double cylinder, or SS signal switch options.
4) Will the Von Duprin 9975 latch into my existing strike?
The 9975 throws a 3/4 inch latchbolt from a mortise case, so it needs a mortise strike in the jamb, not the surface-mounted rim strike a 99 rim device uses. If you're replacing a rim device, the frame prep changes. If you're replacing another mortise exit device, confirm the existing strike accepts a 3/4 inch throw and that the strike height matches the new case position.
5) Can I get a Von Duprin 9975 that meets the 5 lb ADA operating force requirement?
Yes, order it with the AX option. AX is the ADA-certified configuration meeting the 5 lb force requirement per 2010 ADA Chapters 404.2.7 and 30934 and 2013 California Building Code Chapter 11B-309.4. On the 9975-4FT, AX is a yes or no choice at order time, so it has to be specified up front. Also available on the bar is BR Braille pushbar if the facility needs tactile identification.
6) What trim do I order with a Von Duprin 9975 mortise exit device, and is it included?
Trim is a separate selection on the order, not an assumption. Functions run EO exit only (no outside trim at all), NL night latch, K knob and L lever with their variants (K-BE, K-NL, L-BE, L-NL, K-DT, L-DT), TP thumbpiece and TP-BE, plus DT dummy trim. If you pick an L lever function you also pick the lever design: 06 (default), 01, 02, 03, 05, 07, 17 or 18. EO is the common choice on stair and exit-only doors where nobody needs to get back in.
7) Can the Von Duprin 9975 be tied into an access control system?
Yes, and the options are specified when you order. For monitoring: RX request to exit, LX latchbolt monitor, LX-RX combined, WP-RX waterproof RX, RX-LC low current, RX-2 double RX, and SS signal switch. For remote unlocking: EL electric latch retraction, QEL quiet electric latch retraction, or PN pneumatic. QEL is the one to pick where noise matters, like hospital corridors and dorms. Alarm kits are available too, ALK on its own or RX-ALK and LXRX-ALK with switches.
8) What is the difference between a wide stile and a narrow stile mortise exit device?
Wide stile, which the 9975-4FT is, suits hollow metal and wood doors with a full-width stile that can take a mortise case. Narrow stile devices are for aluminum storefront and glass-front doors where the stile is only a couple of inches wide and there isn't room for a wide case. Put a wide stile device on a narrow aluminum stile and it won't fit. For storefront openings, the Adams Rite 8400 Series is the narrow stile mortise device for aluminum doors, and the Sargent 8304 is a narrow stile mortise device in night latch function.
9) What is a wide stile Grade 1 mortise exit device that can be used on a wood door?
The Von Duprin 9975-4FT is not wood door compatible, so for a wood opening look at the Adams Rite 8300 Series, a Grade 1 wide stile mortise exit device for wood and hollow metal doors. Like the 9975-4FT it is not fire rated. If the wood opening is fire rated, the Adams Rite 3300 Series is a fire rated Grade 1 wide stile mortise device for wood and hollow metal doors.
10) My opening is 36 inches wide - what wide stile mortise exit device fits instead of the 48 inch 9975?
The 9975-4FT is sized at 48 inches for wide openings. For a 36 inch door, the Falcon 25-M-EO-3FT is a 36 inch wide stile Grade 1 mortise exit device for 1-3/4 inch doors, the same door thickness the 9975-4FT is designed for, in exit only function.
11) What size door opening does a 48 inch exit device cover?
The 9975-4FT is the 4 foot (48 inch) case size, which is the one for doors up to roughly 4 feet wide. Von Duprin devices are sized to the door leaf, so measure the actual leaf width before ordering. If your leaf is a 3 foot door, a 3 foot device is the right length. Falcon's 25-M-EO is a 36 inch wide stile mortise device if you need that shorter size.
12) How much clearance does the Von Duprin 9975 push pad need off the face of the door?
Projection is 3-13/16 inches from the door face, and the center case measures 8 x 2-3/4 x 2-3/8 inches. That projection is what to check against a corridor width, an adjacent wall return, or a door that swings back against something. The grooved 99 case is the wider architectural case, so allow the full 3-13/16 inches when the door is dogged open and the pad is depressed.
13) How does hex key dogging work on the Von Duprin 99 Series, and what are the other dogging options?
Hex key dogging is standard on the 9975-4FT: an Allen wrench holds the latchbolt retracted so the door pushes free during high traffic periods, no cylinder needed. Other choices when ordering are CD cylinder dogging (keyed, so only keyholders can dog it), CDSI and HDSI which add a security indicator window showing locked or unlocked, DI and CI dogging indicators, SD special center case dogging, and LD less dogging. Schools usually want CD or CDSI so staff can't leave a door dogged unnoticed.
14) Can I get delayed egress on a Von Duprin 99 exit device?
Yes, through the CX CHEXIT upgrade. Configured that way, the device holds the door secure for 15 seconds after someone pushes the pad while a nuisance alarm sounds, which meets NFPA and IBC delayed egress requirements. It's the setup for memory care wings, behavioral health units and retail loss prevention doors where you need to control the exit without blocking it.
15) What is a comparable wide stile mortise exit device to the Von Duprin 9975?
Same class, Grade 1 wide stile mortise: the Corbin Russwin ED5600AL, which fits 1-3/4 inch doors and accepts passage or classroom lever trim (trim sold separately); the Detex 30 Series Advantex, exit only and not wood door compatible; the Falcon 25-M-EO in a 36 inch size, exit only; and the Adams Rite 8300 Series. The Sargent 8904 is a wide stile mortise device in night latch function with 24VAC/DC operation. The main separators are whether you need a fire rating, whether you need outside trim at all, and how much of the electrical option list you plan to use.
16) Is the Von Duprin 9975 Grade 1, and what does that mean for a school or hospital door?
Certified to ANSI/BHMA A156.3 2014 Grade 1, the top grade for exit devices, and listed under ANSI/UL 305 and CAN/ULC-S132. Grade 1 is the cycle and strength tier specified for high-traffic institutional openings, which is why it's what school, hospital and government specs call for. Note it is not fire rated, so labeled openings need a fire exit device instead.
17) Is there a quieter version of the Von Duprin 99 exit device for a hospital or dormitory?
Two ways to cut the noise. QM (Quiet Mechanical) is a yes/no option on the 9975-4FT and reduces the mechanical clack of the pad and latch. If the door is electrified, QEL quiet electric latch retraction is the quiet alternative to standard EL. Both are specified at order time, not added later in the field.
18) If I only need exit only with no outside trim, is there a simpler mortise device than the 9975?
Yes. The 9975-4FT covers a full range of trim functions from exit only through knob, lever, thumbpiece and night latch, so it is specified when the opening may need outside trim. If the opening is push to exit with nothing on the outside, the Falcon 25-M-EO is a Grade 1 wide stile mortise device built in exit only function for 1-3/4 inch doors, and the BEST Precision 2301 is an exit only mortise device with heavy wrought construction. The Detex 30 Series Advantex is a Grade 1 wide stile mortise device supplied device only in exit only function.
19) Is the Sargent 810 a substitute for a 9975 mortise exit device?
No. The Sargent 810 is dummy pull exit device trim in dummy function - it is trim, not a latching exit device. The 9975-4FT is a complete mortise exit device with a 3/4 inch latch throw and an 8 inch by 2-3/4 inch by 2-3/8 inch center case. If the inactive leaf needs a pull only, the 810 fits that role; if the leaf must latch, it does not.
20) What is the difference between a mortise exit device like the 9975 and a surface vertical rod device?
The 9975-4FT is a mortise exit device - the lock case mortises into the door edge and it latches at a single point with a 3/4 inch throw, with a 3-13/16 inch projection off the face of the door. The Sargent 1256NB-8710G is a Grade 1 narrow stile surface mount vertical rod device with electric latch retraction at 84 inches, which latches top and bottom through rods on the door face and needs a different door prep entirely. They are not interchangeable in the same prep.
21) I need a night latch mortise exit device on a wide stile door with 24V operation - what should I look at against the 9975?
The 9975-4FT can be ordered in NL night latch trim function and supports electric latch retraction options including QEL quiet electric latch retraction. The Sargent 8904 is a Grade 1 wide stile mortise exit device built in night latch function with 24VAC/DC operation, so the electrical function is fixed rather than configured. Both are wide stile devices.
22) What mortise exit device should I use if the lever trim is furnished separately by the door supplier?
The Corbin Russwin ED5600AL is a Grade 1 3 hour fire rated mortise exit device that ships exit only and accepts passage or classroom lever trim supplied separately, for 1-3/4 inch doors. The Von Duprin 9975-4FT instead has the trim function chosen with the device, from EO exit only through L lever and L-NL lever night latch, so the trim comes matched to the device.
23) What finishes does the Von Duprin 9975 exit device come in?
Twelve finishes: 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. For matching existing openings across a building, 626 satin chrome and 630 satin stainless are the two that turn up most in institutional work, and 630 holds up best where the pad gets constant hand contact.
24) Can I get a glow-in-the-dark or knurled push bar on a Von Duprin 9975?
Yes. Bar choices are standard, SG safety glow pushbar for egress visibility when the lights drop, KN knurled bar as a tactile warning surface, BR Braille pushbar, and RSS emergency exit push bar. Knurled and Braille bars are what facilities specify when accessibility or hazard identification is part of the spec.
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Does the Von Duprin 9975EO 4 US26D come with a warranty?
Absolutely. The Von Duprin 9975EO 4 US26D is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
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