Dorsis Fortius

Frameless interior doors, flush with the wall

Full-height doors that sit flush with the wall, with no casing, no visible hinges and no visible strike plate. We design the whole door package with you and your architect, create drawings for your construction documents, and support your builder until the last door is hung.

Frameless door made by Angelbau Dorsis. Flush door panel in white, installed in a high-end luxury residence. Interior design combines European white oak hardwood floor and polished onyx wall panels.

Why Dorsis Fortius

Beautiful design meets outstanding engineering

Frameless doors by Angelbau Dorsis in floor-to-ceiling, header, transom, and angled versions.

Bespoke sizes and types

A full-height Dorsis Fortius filomuro door goes all the way to the ceiling. It's an inexpensive way to make every room look instantly taller.

Concealed door frame in various powder-coated custom colors.

Custom color frames

Concealed door frame is powder-coated in a chosen RAL color. Go with white for white doors, or gray/black for veneer doors.

Aluminum extrusion profile for modern frameless doors with an integrated white silicone gasket for sound insulation.

Strong sound insulation

Concealed swing door frame includes a sound-insulating silicone gasket. Available in white, gray, or black.

White concealed door hinges by Anselmi, a Simonswerk company. Used for frameless flush doors made by Angelbau Dorsis.

Concealed door hinges

Door frames are equipped with 3-way adjustable Anselmi or Simonswerk Tectus concealed hinges. White, gray, or black.

Frameless doors with different size glass door panels.

Door glass lites

Bring light to your hallway. Our doors can accommodate a set of glass lites. Available in clear, frosted/satin, bronze, or gray glass.

Architectural door hardware for concealed door by M&T. Model: Minimal 2.0 in brass titanium matte finish.

Designer door hardware

Choose from one of our 1000+ door handles and door pulls, or go with the invisible No-Ha handle.

Magnetic mortise lock. European design with black faceplate.

Magnetic lock

Enjoy high-end design with an invisible strike plate and a flush magnetic latch. The latch bolt stays retracted until the door fully closes.

Planet drop down seal for interior doors.

Drop-down seal

Close the gap between the door and the floor to improve sound and temperature control. An ideal option for mechanical rooms.

Any size, finish, design

Concealed doors made for North America

Full-height doors as well as floor-to-ceiling windows have been a go-to choice for leading modernist architects like Ludwig Mies Van der Rohe. Flush interior doors with concealed door frames are the pinnacle of modern architecture in the United States, a trend pioneered in Europe.

We manufacture custom frameless doors as part of our exclusive door system which includes trimless pocket doors and flush recessed baseboards.

  • Custom sizes to fit any opening
  • Custom finishes
  • Stainless steel, black, bronze, or white hardware
  • Fully integrated with pocket doors, barn doors, baseboards
Invisible door jamb on Fortius 52 white interior inswing door with flush transom. Terrazzo floor in hallway. Recessed ceiling round LED light.

Solid core construction

Designed for durability and beauty

Flush solid core door panel for Dorsis Durus and Dorsis Fortius frameless doors.
Dorsis solid core door

Each panel is a 5-ply (painted doors) or 7-ply (veneer door) solid-core door sandwich. Engineered to support tall doors up to 11'-6" without warping and to accommodate additional cladding and custom paneling.

Ultra smooth finish

The skin of the Dorsis door is an ultra smooth ¼" (6 mm) MDF board providing durable basis for high-end smooth finish – which you won't find in common dual MDF assembly solid core doors.

Excellent sound isolation

Dorsis door slabs use two layers of lightweight MDF bonded to a solid-core base to ensure excellent soundproofing, so you don't hear noise.

5-layer durable paint

Dorsis provides painted doors because site-painted doors never match the quality of a factory finish. For most projects, we use 20% gloss, with an option for high gloss. We use a multistep coating process with low-VOC, water-based paints.

Adjustable straightener

Tall Dorsis door slabs stay flush with the wall thanks to the hidden, adjustable door straightener. If the door goes out of plane, you can adjust the door straightener to bring it back to a perfectly flush position.

Frameless Swing Door Portfolio

Choose door style

Dorsis Fortius offers one of the widest ranges of frameless door installation options: standard swing doors; double doors (active/active or active/passive); full-height doors with a ceiling-recessed header for light and sound insulation; standard full-height doors; or custom angled doors. Also available: Dorsis Fortius Frameless with a solid or glass transom.

Fortius Frameless door styles and options: single door with header, double door with header, full-height with header, full-height without header, angled doors. All have no casing and are flush with the wall.

Keyless entry with smart door locks

Modern garage-to-house door Dorsis Fortius is compatible with keyless access systems and electromechanical locks.
House-to-garage door

The entryway between the house and garage is usually the most used doors in the home. To make entry easy for all household members, we can optionally equip this door with an electronic or electromechanical lock, or a designer thumbturn.

Keyless entry for modern garage-to-house door with RDIF, Bluetooth, NFC and Wi-Fi compatibility.
Keyless entry

A Dorsis concealed door with the Assa Abloy EL560 electromechanical mortise lock has handles on both sides: the outside handle is electrically controlled (by keypad, RDIF card or tag reader, or iPhone via a Bluetooth sensor), the inside handle opens the lock always.

Loxone NFC Code Touch keypad for keyless entry, compatible with modern garage-to-house doors such as Dorsis Fortius.
Integrate access systems

Assa Abloy EL560 electro-mechanical mortise lock is designed to work with smart home automation systems such as Loxone or fingerprint scanner access systems such as ekey biometric systems.

Panic function unlocks the lock in direction of egress in case of emergency.
Panic lock function

Set up your Assa Abloy EL560 to unlock a locked door via the inside handle where the mortise lock pulls the long bolt back and also unlocks the flip latch (panic function). The lock locks automatically when the door closes (automatic locking).

Modern panic bar Hewi for upscale modern offices, compatible with frameless doors with concealed door frame Dorsis Fortius.
Panic bar for exit doors

For commercial applications, you can choose to equip the Dorsis Fortius door with a panic bar (such as HEWI Bar System 111/162) to allow free egress in case of emergency. The inside panic bar always operates and the outside handle is controlled and activated on signal from your access control system.

Integration

Wall paneling

Want to create a hidden door that aligns with paneling? The Fortius Frameless Door System offers several options for adding wood wall paneling, cladding, or slat panel solutions.

The engineering prowess behind this concealed door allows for virtually limitless interior design outcomes.

Installation details

Flexible in any site condition

For wood, steel, concrete framing

The Fortius hidden door frame is flexible - it can be installed in all common wall assemblies, including wood-stud and steel-stud framing. The minimum wall thickness is 4"; there is no maximum limit.

You can easily integrate the Fortius concealed door frame with the Dorsis Linus flush baseboard.

Pre-assembled frame installation

A pre-assembled, perfectly square Fortius door frame is mounted to the rough opening, a much simpler installation method than alternatives.

Fits any drywall thickness

On the flush side, the concealed door frame accepts a ½" drywall sheet. A combination with ⅝" drywall is possible.

On the interior side, the concealed door jamb allows the use of ½" or ⅝" drywall, or wall panels.

Hidden door frame, exterior side of the flush-with-the-wall door with wood veneer finish, in a 2x4 wood stud wall.Hidden door frame, interior side of the flush-with-the-wall door with wood veneer finish, in a 2x4 wood stud wall.

Exterior View

Interior View

Finishes

Highly customizable. Perfected for every project.

Concealed hinges

Residential

Anselmi concealed door hinge white
White
Anselmi concealed door hinge satin chrome
Satin Chrome
Anselmi concealed door hinge matte black
Black

Residential & Commercial (15 FINISHES)

Tectus TE 340 concealed door hinge white
White
RAL9016
Tectus TE 340 concealed door hinge satin chrome look F1
Satin Chrome Look
F1
Tectus TE 340 concealed door hinge black
Black
RAL9005
Tectus TE 340 concealed door hinge satin nickel look
Satin Nickel Look
F2
Tectus TE 340 concealed door hinge satin brass
Satin Brass
Mortise locks

Magnetic Locks

Bonaiti Smart magnetic mortise lock in white finish
Matte White
Bonaiti Smart magnetic mortise lock in satin chrome
Satin Chrome
Bonaiti Smart magnetic mortise lock in matte black
Matte Black
Bonaiti Smart magnetic mortise lock in polished brass
Polished Brass
Frame finishes

RAL Matte powder coating (215 color options)

RAL 9003 Signal White
RAL 9016 Traffic White
RAL 9010 Pure White
RAL 7032 Pebble Grey
RAL 7002 Olive Grey
RAL 7003 Moss Grey
RAL 9004 Signal Black
RAL 9005 Jet Black
Door finishes

Standard Paint - RAL Glossy / Matt (215 COLORS)

RAL 9003 Signal White
RAL 9016 Traffic White
RAL 9010 Pure White
RAL 7032 Pebble Grey
RAL 7002 Olive Grey
RAL 7003 Moss Grey
RAL 9004 Signal Black
RAL 9005 Jet Black

Premium Paint - Benjamin Moore

OC-117 Simply White
OC-130 Cloud White
OC-131 White Down
OC-149 Decorator's White
OC-17 White Dove
OC-18 Dove Wing
OC-45 Swiss Coffee
OC-57 White Heron
OC-65 Chantilly Lace

Engineered wood veneers - Alpi Collection

Technical specifications

Size, Style & Finish. Made To Order.

Shop drawings for inclusion in Construction Documents (CD) available on request for each project.

Dorsis Fortius EI30 is a fire-rated frameless door with a 30-minute rating EI/EW 30 DP3-C (European standard).

Product details

Max door height
11' 6" (3500 mm)
Max single door width
44” (1120 mm)
Max double door width
88” (2240 mm)
Panel thickness
2” standard (52 mm)  
1 ¾"-2 ½" optional (45-64 mm)
Door core
Solid core
Acoustic option
Honeycomb option
Custom panels & finishes
Available