What is the difference between the Von Duprin 98 and 99 series?

The 98 series has a smooth mechanism case for architectural aesthetics, whereas the 99 series features a grooved case. Internally, they are identical.

Can I upgrade a mechanical 98 to electric latch retraction?

Yes, Von Duprin provides QEL conversion kits that allow you to add motorized latch retraction to existing mechanical 98 series devices.

What is Cylinder Dogging on the 98 Series?

Cylinder Dogging replaces the hex-key dogging with a standard mortise cylinder, allowing staff to dog the door open with their facility key.

What is the minimum stile width for the 98 Series?

The 98 Series requires a minimum 4-1/2 inch wide stile. For narrow aluminum storefronts, the 35A Series is the correct choice.

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Corbin Russwin

Von Duprin

Best

Schlage

Sargent

Stanley Hardware

Rixson

Falcon

Yale

PHI

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Authorized Von Duprin 98 Series Distributor | The Architectural Gold Standard

Q: Is the 98 Series fire-rated?

Yes, the 98-F model is UL listed for 3-hour fire-rated doors. Fire-rated devices cannot have mechanical dogging per code.

Expert Field Guide: Premier Performance for High-Profile Openings

When the architectural spec calls for the absolute highest level of durability but demands a refined, modern aesthetic, the Von Duprin 98 Series is the answer. While internally identical to the legendary 99 Series, the 98 is defined by its smooth mechanism case. This sleek profile is the standard for high-end hospitals, university research centers, and corporate headquarters where "industrial" textures like grooves don't fit the design language. This is a Grade 1, heavy-duty "wide stile" device, meaning it's built for doors with a minimum 4-1/2" stile, providing maximum surface area for a rock-solid installation.

The 98 Series isn't just a pretty face; it's a mechanical tank. It features a patented fluid dampener that decelerates the push pad, ensuring the device operates with a quiet, high-end feel rather than a loud metallic rattle. For facility managers, the 98 Series represents the lowest total cost of ownership because it is designed to withstand millions of cycles in the most abusive environments. Whether you need a 98 Rim Device for a single stairwell door or a 9827 Surface Vertical Rod for a grand entrance, this series sets the benchmark for life safety. Lock Depot sells brand new Von Duprin products with the full manufacturer warranty.

For the professional installer, the 98 Series offers unparalleled modularity. It is field-reversible and field-sizeable, but its true strength lies in its electrification options. From the QEL (Quiet Electric Latch Retraction) for touchless entry to integrated request-to-exit (RX) switches, the 98 Series integrates seamlessly into any modern access control system. We stock the 98 in premium finishes including US26D (Satin Chrome), US3 (Polished Brass), and 313 (Dark Bronze) to ensure your hardware matches the building's architectural vision perfectly. Lock Depot sells brand new Von Duprin products with the full manufacturer warranty.

Von Duprin 98 Series Comparison

Model	Application / Best Use Case	Grade	Style	Key Differentiator	Price
98 Rim	Single Wide Stile Doors	Grade 1	Smooth Case	The premier architectural rim device	$$$$
9827 SVR	Pairs of Doors (Surface Rods)	Grade 1	Smooth Case	Two-point locking for high-profile entries	$$$$$
9847 CVR	Concealed Vertical Rod	Grade 1	Smooth Case	Hidden rods for the cleanest possible look	$$$$$
9875 Mortise	Heavy-Duty Mortise Exit	Grade 1	Smooth Case	Maximum physical security and bolt strength	$$$$$

Pro-Tip: Timing the "Fluid Dampener"

If you notice the push pad on a 98 Series feels "sluggish" or doesn't return quickly, don't assume the spring is broken. The fluid dampener is adjustable. Over time, or in extreme temperature changes, the fluid viscosity can affect the speed of the bar. You can fine-tune the return stroke to ensure the door relatches perfectly every time. Also, when installing the 996L Lever Trim, ensure the tailpiece is not binding. Because the 98 is so precisely engineered, even a slight misalignment in the door prep will cause the lever to feel stiff. Use the Von Duprin template—don't "eye-ball" the 161 prep.

Frequently Asked Questions

What is the difference between the 98 and 99 series?

The internal mechanics, parts, and Grade 1 ratings are exactly the same. The only difference is the mechanism case: the 98 Series has a smooth case for a sleek architectural look, while the 99 Series has a grooved case for an institutional look.

Can I upgrade a mechanical 98 to a QEL electric version?

Yes. Von Duprin offers QEL Conversion Kits. You can remove the mechanical baseplate of an existing 98 Series and replace it with the motorized QEL baseplate without removing the device from the door. This is a massive time-saver for access control retrofits.

What is "CD" Cylinder Dogging on the 98 Series?

Standard devices use a hex-key to lock the bar down. Cylinder Dogging (CD) replaces the hex-key hole with a standard mortise cylinder. This allows a security guard or teacher to "dog" the door open for business hours using their standard key instead of a specialized tool.

Is the 98 Series fire-rated?

Yes, but you must specify the 98-F model. Fire-rated devices are UL listed for use on 3-hour fire doors. Remember that fire-rated hardware cannot have a mechanical dogging feature, as the door must remain latched to satisfy fire codes.

What is the minimum stile requirement?

The 98 Series is a "Wide Stile" device. It requires a minimum stile width of 4-1/2 inches (114mm). If you are working with narrow aluminum storefront stiles (1-3/4"), you should look at the 35A Series instead.