SUPERTHERMIC insulated industrial doors adapt to many customizations, for every type of installation and architectural style
industrial panel sliding door

Folding door without lower rail - LIBER

Hangar Shield LIBER – Bifold Panel Doors Without Lower Rail

Folding door with patented drive system housed in the exclusive top rail in galvanized steel with reduced dimensions (only 150 mm) and galvanized steel side jambs with gaskets and “L”-shaped brackets, which allow adjustment on 3 axes. The bottom closure is guaranteed by a striker fixed to the floor and two point locking internal Cremone bolt with adjustable stainless steel terminals.

Doors connected with exclusive black painted galvanized steel hidden hinges with ball bearings.

NOTE:  the SUPERTHERMIC LIBER industrial door is also available in the evolved ISOMAX thermal break version with height limitations 

Industrial, Aviation and Military‑Grade Folding/Bifold Doors for Large Openings
Hangar Shield LIBER is a heavy‑duty bifold panel door system engineered for industrial closures, aviation hangars, military facilities, airport buildings and large storage warehouses.
Designed as a folding bifold door without a lower floor rail, LIBER provides smooth, unobstructed access for aircraft, vehicles and equipment in demanding environments.

Product Description
LIBER is a unilateral or bilateral opening bifold door, available with manual or motorized drive.
The door panels fold to the side and can be stored at 90° or 180°, allowing maximum flexibility for façade design and internal space management.
• Door type: Folding / bifold panel door
• Rail system: No lower rail, top‑guided
• Opening: One‑side (unilateral) or two‑side (bilateral)
• Operation: Manual or motorized
• Panel parking: 90° or 180°

Key Features
• True bifold panel design for wide industrial and aviation openings
• No floor rail, ensuring a clean, obstacle‑free surface for aircraft tugs, forklifts and vehicles
• Heavy‑duty upper track with reinforced hinges and rollers
• Flexible opening configurations to suit building layout and traffic flow
• Space‑saving panel parking at 90° or 180°
• High wind resistance for exposed airfield and industrial locations
• Low maintenance due to rail‑free floor design
• Compatible with automation, safety sensors and access control systems

Applications
• Aviation hangars (MRO, FBO, private, helicopter)
• Military and defence structures
• Airport buildings and GSE storage
• Industrial factories and production halls
• Large warehouses and logistics centres
• Vehicle depots and maintenance bays

Benefits
• Maximum clear opening with no floor obstruction
• Improved safety for personnel and equipment
• Durable steel structure designed for intensive use
• Architectural flexibility with multiple cladding and glazing options
• Smooth, reliable operation even in harsh climates

Technical Highlights
• Steel panel construction with reinforced frames
• Top‑guided system with precision rollers
• Manual or motorized operation
• 90° or 180° leaf parking
• Optional insulation, glazing and custom finishes
• Integration with building management and safety systems

Possible Configurations :

Three diagrams show beams labeled X and Y, supported by various braces—no brace, a vertical brace, and two angled braces—as seen in Hangar Shield industrial doors. Distances and support configurations differ in each diagram.

See All Configurations

Six diagrams showing beam support configurations for Hangar Shield industrial doors, labeled with equations such as 3+3, 3+1, 3+2, 4+0, 4+2, and 4+4, each illustrating different load distributions.
  • Door leaves: self-supporting mono-structures (variable dimensions – Max height 6000 mm)
  • Door leaf width: 1450 mm max
  • Door leaf thickness: 55 mm
  • Insulation: complete self-extinguishing Class B2 CFC-free (Chlorine, Fluoride, Carbides) polyurethane insulation. High-pressure foaming cycle with density > 40 Kg/m3
  • Perimeter frame: dovetail shaped profile, thickness 2 mm

Double skin coating of galvanized pre-painted steel sheet with Sendzimir treatment

  • Smooth, thickness 0.8 + 0.8 mm
  • Embossed, thickness 0.5 +0.5 mm
A close-up of a rectangular metallic object with a brush strip attached near its base, possibly a Hangar Shield or a seal component for industrial doors.
Diagram of a Hangar Shield folding door system with a maximum height of 6,000 mm and width of 12,000 mm, shown as two 4-panel industrial doors meeting in the center.

Maximum Dimensions:

4 + 4 configuration; height 6000 mm; width 12,000 mm

Air Tightness:

  • Black EPDM anti-crush/anti-ageing gaskets
  • Black nylon brush, with black pre-coated support profile on the floor

Unilateral or bilateral closing/opening

  • Manual
  • Motorized

On request, patented system of special strikers to be recessed in the floor with telescopic operation to facilitate the transit of vehicles.

Leaf Configuration:

90° o 180°

CE Marking data:

  •  Wind load resistance, class 4
  •  Thermal resistance, 1.53 W/m2 K (calculated value for a 4-leaf door 5000×5000)
  •  Average noise reduction, 22 dB (non-certifiable)
  • Fire resistance, B -S1, d0
  •  Durability 20,000 cycles

Extras:

  • Pedestrian door
  • Inspection window with perimeter profile in rubber with the insertion of 8/9 laminated glass with rounded corners
  • Inspection window with perimeter profile in black aluminium with thermal break with 90° corners and insertion of double-glazed or laminated glass up to a maximum thickness of 40 mm
  • Ventilation grille with fixed slats.Dimensions 600 x 300 H or 1000 x 600 H
Go to the EXTRAS page ››

Application:

  • Internal
  • External
  • In-wall

Colours Available:

Smooth panel or with vertical micro-ribbing pitch160 mm

  • Smooth sheet metal: White similar to RAL9002, Red RAL3000, Green RAL6005, Blue RAL5010, Grey RAL9006, Grey RAL7016, Brown similar to RAL8019 and Wood tone SL65
  • Embossed sheet metal: White similar to RAL9002, Grey RAL9006, Green RAL6005.

Painting in the other RAL colours available on request.

A building with an orange facade features three large industrial doors, one with a pedestrian door, and solar panels installed on the roof, offering robust Hangar Shield protection.
Large red Hangar Shield industrial door with eight vertical panels, each featuring a round black window; one panel includes a centered door with a handle.
A Industrial Insulated panel doors modern Trucks service center building featuring multiple large industrial doors and a "Services" sign above the entrance, offering the security of Hangar Shield technology.
A row of large, closed Hangar Shield industrial doors lines the side of a modern building with windows and a paved walkway.
Hangar Shield industrial doors with rectangular windows, pedestrian door and window
Two large white Hangar Shield industrial doors set in an orange, tile-patterned building wall, with a red fire hose box and fire hydrant positioned between them.
Large Hangar Shield industrial doors with six gray panels, each featuring a small rectangular window, are closed inside a building.