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Von Duprin 3348A/3548A-3 Concealed Vertical Rod Exit Device - Narrow Stile, 3-Foot, Grade 1
Heavy-Duty Concealed Vertical Rod Solution for Hollow Metal Single and Double Doors
The Von Duprin 3348A/3548A-3 Concealed Vertical Rod Exit Device is a professional-grade, ANSI/BHMA A156.3 2014 Grade 1 certified panic exit hardware solution engineered for hollow metal single and double doors. Fitting door stiles as narrow as 2-1/8" (44 mm), this 3-foot (36") device features a 1-1/2" latch throw and is designed for demanding institutional applications including schools, hospitals, and government buildings. The 3348A model features a grooved mechanism case while the 3548A offers a smooth mechanism case, both sharing a newly designed one-piece center case cover. The device is non-handed, providing installation flexibility, except when the SS (Signal Switch) option is used.
Professional Features & Benefits
- Narrow Stile Compatibility: Fits door stiles as narrow as 2-1/8" (44 mm), making it ideal for narrow stile hollow metal single and double door applications.
- 3-Foot Device Size: Sized at 36" with overall product dimensions of 8-3/16" x 1-9/16" x 2-13/32" and a product projection of 3-13/16" for precise, low-profile installation.
- Grade 1 Certified Performance: ANSI/BHMA A156.3 2014 Grade 1 certified and UL listed for panic exit hardware, meeting the highest industry standards for commercial door security.
- Non-Handed Design: Non-handed configuration (except when SS Signal Switch option is used) simplifies inventory management and installation across varied door orientations.
- Versatile Door Thickness & Fastener Compatibility: Designed for 1-3/4" door thickness with included 1-3/4" and 2-1/4" wood/metal door fasteners and SNB included for straightforward installation.
- Field-Configurable Options: Supports a broad range of functions including EO, DT, NL, NL-OP, L, L-BE, TL, TL-BE, T, and T-BE, with hex key dogging configuration for operational flexibility.
- Retrofit & Upgrade Ready: Compatible with CDSI/HDSI security dogging indicators, QEL electronic latch retraction, RX (Request to Exit) and LX (Latchbolt Monitoring) electronic switches, AX accessible device upgrade (certified to 5 lb. force ADA requirements), and CX CHEXIT delayed egress option meeting NFPA and IBC requirements.
- Multiple Certifications: Meets ANSI/UL 10C (fire-rated configurations), ANSI/UL 305, CAN/ULC-S104 (fire-rated configurations), and CAN/ULC-S132 standards for comprehensive code compliance.
Technical Specifications
- Product Group: Exit Devices and Trim
- Series: 33 & 35 Series
- Grade: Grade 1
- Fasteners: Includes 1-3/4" and 2-1/4" wood/metal door fasteners, SNB included
- Product Subgroup: Exit Devices - Vertical Rod
- Product Type: Exit Devices - Concealed Vertical Rod
- Subcategory: Concealed Vertical Rod Exit Devices
- Latch Throw: 1-1/2"
- Commercial/Residential: Commercial
- Device Centerline from Finished Floor: 39-13/16"
- Stile Type: Narrow Stile
- MAP Policy: Yes
- Product Model: 3348A/3548A-3'
- Product Function: EO, DT, NL, NL-OP, L, L-BE, TL, TL-BE, T, T-BE
- Door Hand Direction: Non-Handed
- Door Thickness Range: 1-3/4"
- Product Size: 36"
- Dogging Configuration: Hex Key Dogging
- Product Dimension: 8-3/16" x 1-9/16" x 2-13/32"
- Fire Rating: No
- Product Projection: 3-13/16"
- Product Style: Push Pads
- Product Category: Exit Devices and Trim
- Department: Door Hardware
Professional Applications
- Schools and Educational Facilities
- Hospitals and Healthcare Institutions
- Government and Municipal Buildings
- Commercial Office Buildings
- Industrial and Warehouse Facilities
- Multi-Tenant Residential Properties
- Retail Establishments
Why Choose Von Duprin Quality?
Von Duprin concealed vertical rod exit devices are engineered to the highest industry standards, with ANSI/BHMA A156.3 2014 Grade 1 certification and UL listing for panic exit hardware ensuring dependable performance in the most demanding institutional environments. The 3348A/3548A-3 is purpose-built for high-use and high-abuse applications, featuring a robust one-piece center case cover, narrow stile compatibility down to 2-1/8", and a comprehensive suite of field-configurable and retrofit options. Engineered for commercial applications where code compliance, durability, and operational flexibility are essential.
Manufacturer Resources
Von Duprin 78/75 Series Catalog
Product Specs
- Product Group:
- Exit Devices and Trim
- Series:
- 33/35 Series
- Grade:
- Grade 1
- Fasteners:
- Includes 1-3/4" and 2-1/4" wood/metal door fasteners, SNB included
- Product Subgroup:
- Exit Devices - Vertical Rod
- Product Type:
- Exit Devices - Concealed Vertical Rod
- Subcategory:
- Concealed Vertical Rod Exit Devices
- Latch Throw:
- 1-1/2"
- Commercial/Residential:
- Commercial
- Device Centerline from Finished Floor:
- 39-13/16"
- Stile Type:
- Narrow Stile
- MAP Policy:
- Yes
- Product Model:
- 3348A/3548A-3'
- Product Function:
- EO, DT, NL, NL-OP, L, L-BE, TL, TL-BE, T, T-BE
- Door Hand Direction:
- Non-Handed
- Door Thickness Range:
- 1-3/4"
- Product Size:
- 36"
- Dogging Configuration:
- Hex Key Dogging
- Product Dimension:
- 8-3/16" x 1-9/16" x 2-13/32"
- Fire Rating:
- No
- Product Projection:
- 3-13/16"
- Product Style:
- Push Pads
- Product Category:
- Exit Devices and Trim
- Department:
- Door Hardware
Von Duprin VON-3348A-3-626 – Frequently Asked Questions
1) Do I have to specify a hand when ordering a Von Duprin 33A or 35A concealed vertical rod device?
The device itself is non-handed, so one part number covers left and right openings. Two things do carry a hand: the SS signal switch option, and the NL night latch trim, which is ordered as either 386NL right hand reverse or 386NL left hand reverse. The L lever trims are field reversible, so those you can flip on site.
2) What do I have to pick besides the device itself on a Von Duprin 33/35A concealed vertical rod order?
Two choices are mandatory. First the trim function: EO exit only, DT dummy trim 386DT, NL night latch 386NL, NL-OP night latch cylinder with optional pull 388, L lever 360L, L-BE lever with blank escutcheon, L-DT lever dummy trim 360L-DT, TL turn lever 376T/386, TL-BE, T thumbturn 360T, or T-BE. Second the dogging: hex key dogging is the default, or CD cylinder dogging, CDSI cylinder dogging with indicator, HDSI hex dogging with indicator, or LD less dogging. Optional on top of that are the lever design (06 is the default on L trims, plus 03, 07, 17 and Latitude), mechanical options GBK glass bead kit, SEC security screws and WH weep holes, and electrical options EL, QEL, ALK, LX and RX.
3) Will the Von Duprin 3348A/3548A-3 latch into my existing top and bottom strikes?
The latch throw is 1-1/2 inches at the head and the sill. That is a deep throw, so the existing strike pockets have to be cut for it, and the floor strike or threshold needs the depth. If your opening was previously running a different brand of concealed rod device, verify the strike prep depth before you order rather than assuming the rods drop in.
4) Can I get a Von Duprin concealed vertical rod device with electric latch retraction for an access control system?
Yes. EL electric latch retraction and QEL quiet electric latch retraction are both orderable on the 33/35A, which is how you tie the device into a card reader or a push button and let the latches pull back on command. For monitoring rather than control, add RX request to exit or LX latchbolt monitor. ALK alarm exit kit is available if you want a local alarm on the door. CX CHEXIT delayed egress is also supported where the code official allows it.
5) I need a 36 inch narrow stile concealed vertical rod device. What are my options besides Von Duprin?
The 3348A/3548A-3 is the 36 inch, 3 foot size for narrow stile. Close alternatives we carry: the Falcon 24-C at 36 inches narrow stile exit only Grade 1, the Falcon 1690EO at 3 feet narrow stile Grade 1, the Corbin Russwin ED4800 narrow stile Grade 1 which accepts trim, and the DORMA 9600BB at 36 inches narrow stile Grade 1 non-fire-rated. The main functional split: the Falcon 24-C and 1690EO are exit only, while the Von Duprin and the Corbin Russwin ED4800 take lever, thumbturn and night latch trim for outside access. The DORMA 9600BB also covers 1-3/4 to 2-1/4 inch doors, so it is the one to look at on a thicker leaf.
6) Do I need a mullion between a pair of doors with a concealed vertical rod exit device?
No. A vertical rod device latches into the head frame and the floor or threshold rather than into a strike on the opposite leaf, so a pair runs free swinging with no center mullion and gives you the full clear opening. That is the main reason to choose concealed vertical rod over a rim device, which does need a removable mullion on a pair. The 33/35A works on both single and double hollow metal doors.
7) The opening needs a fire-rated concealed vertical rod device - what replaces the Von Duprin 3348A/3548A-3?
The 3348A/3548A-3 is not fire rated, so a rated opening needs a different device. The Adams Rite 3900 Series is a fire-rated Grade 1 concealed vertical rod device with a 1-1/2 hour rating, and the Adams Rite 3600 Series is a fire-rated Grade 1 concealed vertical rod device for hollow metal doors; both are wide stile. On the wide stile side with a specific function, the Sargent 12-MD8613 is a fire-rated Grade 1 classroom-function concealed vertical rod device. All three are wide stile, so confirm the door stile before ordering against a narrow stile opening.
8) Which concealed vertical rod device should I use if the door is wide stile instead of narrow stile?
The Von Duprin 3348A/3548A-3 is built for narrow stile doors down to 2-1/8 inch. For a wide stile door, the Corbin Russwin ED5800 is a Grade 1 wide stile concealed vertical rod device for 1-3/4 inch doors that is exit only and accepts trim, and the DORMA 9100 Series is a heavy duty Grade 1 wide stile pushpad concealed vertical rod device covering 1-3/4 inch to 2-1/4 inch doors. The Adams Rite 8500 Series is a wide stile Grade 1 non-fire-rated concealed vertical rod device for hollow metal doors.
9) Should I use a concealed vertical rod exit device or a surface vertical rod on my hollow metal doors?
Concealed rods, like the 33/35A, run inside the door, so nothing is exposed to be kicked, caught by a cart, or vandalized, and the door face stays clean. That is why they end up in schools, hospitals and government buildings. The trade off is the door has to be prepped for concealed rods, which usually means ordering the door that way rather than retrofitting an undrilled slab. A surface vertical rod mounts on the face of any existing door and is the easier retrofit. If your doors are already cut for concealed rods, stay with concealed.
10) How much clearance do I need in the corridor for a Von Duprin 33/35A push pad device?
Projection is 3-13/16 inches off the door face, and the mechanism case measures 8-3/16 x 1-9/16 x 2-13/32 inches. Mount the device on the 39-13/16 inch centerline from finished floor. Those numbers matter in tight vestibules and where the door swings toward a wall or a second leaf, since the push pad is what sticks out furthest.
11) What is the difference between the Von Duprin 33A and 35A case, and does it change the fit?
Purely cosmetic. The 33A has a grooved mechanism case and the 35A a smooth one; both use the same one-piece center case cover and the same specs, so fit, throw, stile minimum and function are identical. Pick whichever matches the other openings in the building. Both cases come in all ten finishes: 605 bright brass, 606 satin brass, 612 satin bronze, 613 oil rubbed bronze, 625 bright chrome, 626 satin chrome, 628 aluminum, 643E aged bronze, 710 dark bronze anodized and 711 flat black.
12) Are the mounting fasteners included with the Von Duprin 3348A/3548A-3, or do I order them separately?
Fasteners come in the box: 1-3/4 inch and 2-1/4 inch wood and metal door fasteners, plus SNB. What is not in the box is the trim, which is a separate required selection, and any dogging cylinder if you spec CD or CDSI instead of the standard hex key dogging.
13) Can I hold the doors open during business hours with the Von Duprin 33/35A?
Yes, through dogging. Hex key dogging is standard, which depresses and holds the push pad so the door pushes free. If you do not want a loose hex key floating around the building, order CD cylinder dogging so it takes a keyed cylinder instead. CDSI and HDSI add a visual indicator so staff can see at a glance whether the device is dogged. Note that dogging is not permitted on fire doors, but that is moot here since the 33/35A is not fire rated.
14) Does the Von Duprin 3348A/3548A meet ADA operating force requirements?
Not as standard, but there is an option for it. The AX accessible device upgrade is certified to the 5 lb. force ADA requirement. Specify AX where the opening has to meet accessible operating force, such as a public entry or a barrier-free route in a school or healthcare facility.
15) I want outside key access but no lever on a Von Duprin concealed vertical rod. What trim do I order?
Order the NL night latch trim, 386NL, which is a cylinder and pull that retracts the latch from outside without putting a lever on the door. Specify it as right hand reverse or left hand reverse for your opening. NL-OP, the 388, gives you the night latch cylinder assembly with an optional pull if you want to choose the pull separately. If you want no outside operation at all, EO exit only is the trim-free choice.
16) What is the difference between a narrow stile and a wide stile concealed vertical rod exit device?
It is about how much door face the device has to mount to. Narrow stile devices like the Von Duprin 33/35A go down to a 2-1/8 inch stile, which is what you get on glazed hollow metal and aluminum doors where the glass leaves little frame. Wide stile devices need more material and will not fit those openings. Among the wide stile concealed vertical rod options we carry are the Corbin Russwin ED5800, the DORMA 9100 and the Adams Rite 8500. Measure the flat of the stile before choosing; if it is under about 2-1/8 inches, neither family will work and the door has to change.
17) Is the Von Duprin 33/35A tough enough for a high traffic school entrance?
It is certified ANSI/BHMA A156.3 2014 Grade 1, the top commercial grade for exit devices, and it is a commercial-only device. Grade 1 is the cycle and strength tier specified for institutional openings. If you are standardizing a fleet of doors, the device is non-handed, so one stocked part number covers every opening in the building and only the trim and dogging vary.
18) I only need exit only with no outside trim - is there a simpler narrow stile concealed vertical rod device?
Yes. The Von Duprin 3348A/3548A-3 is field-configurable across EO, DT, NL, NL-OP, L, L-BE, TL, TL-BE, T and T-BE trim functions. If the opening only ever needs push-to-exit, the Falcon 24-C is a Grade 1 narrow stile concealed vertical rod device supplied as 36 inch exit only for 1-3/4 inch doors, and the Falcon 1690EO is a Grade 1 narrow stile exit only device at 3 feet for the same door thickness. The BEST Precision 2601 is also an exit only narrow stile non-handed concealed vertical rod device.
19) I need a classroom function concealed vertical rod device - does the Von Duprin 3348A/3548A-3 do that?
The 3348A/3548A-3 is built with EO, DT, NL, NL-OP, L, L-BE, TL, TL-BE, T and T-BE trim functions. If the hardware schedule specifically calls out classroom function, the Sargent 12-MD8613 is a Grade 1 classroom function concealed vertical rod device and it is fire rated, though it is a wide stile device rather than narrow stile.
20) My door has glass in it. Is there anything extra I need to order with the exit device?
Ask for GBK, the glass bead kit, when the device mounts on a glazed hollow metal door. It handles the glass stop interference at the case. Two other mechanical options worth knowing: SEC security screws for doors that get tampered with, and WH weep holes for exterior openings where water can get into the door.
21) Which lever designs can I get on the L trim for a Von Duprin 33/35A?
Five lever designs on the L trims: 06, which is the default, plus 03, 07, 17 and the Latitude LAT lever. All L trims are field reversible, so the lever handles either swing without a separate part number. Match the design to whatever is already on the other doors in the building. The escutcheon options are separate: 360L is the standard lever trim, 360L-BE has a blank escutcheon for openings that need no cylinder, and 360L-DT is a dummy trim pull only.
22) What wide stile concealed vertical rod option is there from BEST Precision?
The BEST Precision 2801 Series is a wide stile concealed vertical rod exit device, and the BEST Precision 2701 Series is a wide stile reversible concealed vertical rod device for wood doors. The Von Duprin 3348A/3548A-3 is a narrow stile device for hollow metal doors, so the BEST wide stile pair applies where the stile is too wide for the Von Duprin or the door leaf is wood.
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