DORMA RTS88 Series Overhead Concealed Door Closer
The RTS88 is designed to give lasting, dependable service where surface applied units and other types of closers are not suitable, or would interfere with the architectural design. It can be easily installed in wood, aluminum, or hollow metal doors and frames, for single and double-acting doors.
- Concealed installation
- For single and double-acting doors
- Dependable and easy to Install
Aesthetic advantages
Architects are often challenged to design buildings that are both beautiful and functional, down to the last detail. The DORMA RTS88 overhead concealed door closer offers the perfect solution for those who prefer the aesthetic advantages of a concealed door closer.
Vandalism protection
The RTS88 is an excellent replacement closer for problem entrances encountering vandalism of surface applied closers.
Benefits for the contractor
Contractors appreciate the RTS88 closer, because the majority of door and frame preparation is done prior to installation of the unit, resulting in less on-site machining.
Resources:
RTS88 Series Catalog
Manufacturer Resources
Product Specs
- Product Group:
- Door Controls
- Series:
- RTS Series
- Product Subgroup:
- Door Closers - Overhead Concealed
- Product Type:
- Overhead Concealed Door Closers
- Subcategory:
- Concealed Door Closers
- Door Weight:
- 250 lbs
- Door Swing:
- Single Acting
- Commercial/Residential:
- Commercial
- Package Features:
- Hinge or 3/4" Offset ; Wood Door and Frame
- Product Model:
- RTS29
- Door Hand Direction:
- Non-Handed
- Product Category:
- Door Controls
- Department:
- Door Hardware
Dormakaba RTS29 105 NHO SZ3 600 – Frequently Asked Questions
1) How heavy a door can the Dorma RTS29 concealed closer handle?
The RTS29 is rated to 250 lbs of door weight. That covers most commercial wood entrances. If your leaf is lighter and you are working in aluminum, the Norton Rixson 0608 Series offset hung concealed closer is listed for aluminum doors up to 200 lbs.
2) Do I need to order a left hand and a right hand version of the RTS29?
No, one part covers both. The RTS29 is non-handed, so the same closer goes into a left hand or right hand opening. That matters if you are stocking for a building with doors swinging both directions, since you carry one spring size and finish combination instead of two.
3) Can I use the RTS29 on an aluminum storefront or hollow metal door?
The RTS29 build is configured for a wood door and frame with hinge or 3/4 inch offset pivot hanging. The RTS88 family as a whole installs in wood, aluminum, or hollow metal, so if you are working in an aluminum storefront or hollow metal frame you want the RTS88 variant prepped for that material rather than this one. For aluminum specifically, the Norton Rixson 0608 Series is an offset hung concealed closer built for aluminum doors.
4) Which concealed closer should I choose if the door needs to swing a full 180 degrees?
The RTS29 is offered with a 90 degree or 105 degree cushion stop, so its swing is set at one of those two points. For an opening that has to go to 180 degrees, the Sargent 269 is an overhead concealed closer with 180 degree opening capability, built heavy duty Grade 1.
5) Can I get the RTS29 concealed closer with hold open?
Yes, hold open is a yes/no choice you make when ordering, and it pairs with a cushion stop setting of either 90 or 105 degrees. Order the non-hold-open build for any fire rated or egress opening where the door must self close.
6) What is the difference between the 90 degree and 105 degree cushion on this closer?
The cushion setting is where the closer starts absorbing the swing at the end of opening, so it sets how far the door travels before it is stopped. Choose 90 degrees when a wall, adjacent door, or sidelight limits the swing, and 105 degrees where you want wider clearance for carts, luggage, or furniture moves. Both settings are offered on the RTS29 and both can be had with or without hold open.
7) When do I need the 5mm extended spindle option on the RTS29?
The RTS29 ships either standard or with a 5mm extended spindle. Order the extended spindle when the top rail or header condition puts the arm farther from the closer body than the standard spindle reaches, which commonly happens with thicker wood rails or an applied header trim. Measure the spindle-to-arm gap on the actual opening before you commit to one or the other.
8) Why would I use a concealed closer like the RTS88 instead of a surface mounted closer?
Two reasons drive it. The closer body sits inside the head frame so nothing breaks the sightline of the entrance, which is why architects specify it on feature openings. The other is abuse: a concealed unit gives vandals nothing to grab or pry, so it is a common replacement on problem entrances where surface closers keep getting torn off. The tradeoff is that adjustments and service mean getting into the head, and most of the door and frame prep has to be done before the unit goes in.
9) Is the RTS29 an interior only closer, or can I use it on an exterior entrance?
Both. The spring sizing is written for either condition: SZ3 covers 2'-6" to 3'-0" exterior doors and 3'-0" to 3'-6" interior, and SZ4 steps up to 3'-0" to 3'-6" exterior and 3'-6" to 4'-0" interior. There is also a barrier free exterior option, BFE, at a 3'-0" door width for accessible entrances. Exterior leaves generally need one size up from the same width indoors because of wind load.
10) Should I pick a fixed spring size on the RTS29 or an adjustable spring power closer?
The RTS29 is ordered with the spring size fixed at the time of purchase: BFE and BFI barrier free options, SZ2 light opening force, SZ3 for 3 ft 0 in to 3 ft 6 in interior and 2 ft 6 in to 3 ft 0 in exterior doors, and SZ4 for 3 ft 6 in to 4 ft 0 in interior and 3 ft 0 in to 3 ft 6 in exterior doors. If you would rather set the power after the unit is in the door, the CRL Jackson 20-101M-17 is an adjustable spring power concealed closer body at 105 degree non hold open.
11) I only need to replace the closer body in an existing concealed pocket - is the RTS29 the right order?
The RTS29 is ordered as a complete concealed closer configuration with spring size, cushion angle, hold open, finish and package option selected. If your existing header prep is a CRL Jackson pocket and you are replacing only the mechanism, the CRL Jackson body-only units cover that: 20-101M-01 is regular duty, 105 degree, non hold open; 20-101M-03 is regular duty, 90 degree, non hold open; 20-101M-09 is heavy duty, 105 degree, non hold open; and 20-101M-17 is an adjustable spring power body, 105 degree, non hold open. Body-only parts only drop in where the existing pocket and hardware match that line.
12) I need a concealed closer with a low opening force for ADA compliance - does the RTS29 do that or should I look elsewhere?
The RTS29 is ordered with barrier free spring sizes: BFE for light opening force on exterior doors at 3 ft 0 in door width and BFI for light opening force on interior doors at the same width, plus SZ2 for light opening force generally. That selection is made on the RTS29 itself, so you do not need to move to another line to get reduced opening force on a single acting wood door.
13) Is a CRL Jackson regular duty concealed closer body a substitute for the RTS29 on a 250 lb wood door?
Treat them as different products rather than interchangeable. The CRL Jackson 20-101M-01 and 20-101M-03 are regular duty concealed closer bodies only, at 105 degree and 90 degree non hold open respectively, and 20-101M-09 is the heavy duty body. The Dorma RTS29 is a complete single acting concealed closer configuration for wood door and frame, hinge or 3/4 inch offset hung, rated to a 250 lb door, with hold open available and finishes from prime coat and aluminum through statuary bronze, dull bronze, black, dark duradonic bronze and gold.
14) I need hold open on a concealed closer - which of these offer it?
The RTS29 is ordered with hold open as a yes or no selection, so it can be supplied either way alongside the 90 degree or 105 degree cushion. The CRL Jackson concealed bodies 20-101M-01, 20-101M-03, 20-101M-09 and 20-101M-17 are all non hold open units, so if hold open is a requirement they will not meet it.
15) What finishes does the Dorma RTS29 come in and can I match other hardware on the opening?
Seven finishes: 600 prime coat, 689 aluminum, 690 statuary bronze, 691 dull bronze, 693 black, 695 dark duradonic bronze, and 696 gold. The 600 prime coat is the one to order when the exposed parts are being painted to match a wood or storefront system. Since these are standard BHMA finish numbers, 689 and 690 will read the same as the matching numbers on your pulls and pivots.
16) Is this closer suitable for a high traffic commercial building or is it residential grade?
Commercial. The RTS29 is a commercial rated overhead concealed closer carrying a 250 lb door weight capacity, which is why it turns up on institutional, hospitality, and multi-family entrances. Standardizing a facility on it is straightforward since the unit is non-handed, so one configuration covers openings swinging either direction.
How fast can I get the Dormakaba RTS29 105 NHO SZ3 600 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 Dormakaba RTS29 105 NHO SZ3 600 come with a warranty?
Absolutely. The Dormakaba RTS29 105 NHO SZ3 600 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 Dormakaba RTS29 105 NHO SZ3 600?
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 Dormakaba RTS29 105 NHO SZ3 600 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.