Robust inna dor 240 steel fire rated steel doorsets

Inna-Dor 240 Internal Fire Rated Steel Doorset

The Inna-Dor 240 sets the benchmark for high-performance internal fire protection, delivering an exceptional 4 hours (240 minutes) of fire resistance without compromising on aesthetics or functionality. Designed specifically for internal applications, this doorset combines industrial-grade strength with a refined finish, making it the ideal choice for environments where safety, durability, and style are paramount.

Manufactured in the UK, the Inna-Dor 240 is engineered from corrosion-resistant Magnelis® steel, which offers superior longevity and performance compared to standard galvanised alternatives. This advanced material composition allows us to offer an industry-leading anti-corrosion warranty of up to 10 years, ensuring your investment remains protected even in demanding internal environments.

Unrivalled Fire Protection

Safety is the core of the Inna-Dor 240. Fully tested and certified to BS EN 1634-1 and BS 476 Parts 20 & 22, this doorset provides:

• 240 Minutes Integrity (FD240): Proven to contain fire and smoke for up to 4 hours, allowing ample time for safe evacuation and emergency response.
• CERTIFIRE Accreditation: Third-party verification ensures consistent manufacturing quality and traceability for complete peace of mind.
• Versatile Configuration: Available as single or double doorsets to suit various structural openings and escape routes.

Superior Construction & Performance

The Inna-Dor 240 is built to withstand the rigours of high-traffic commercial use while offering advanced performance features:

• Robust Leaf Design: 54mm thick door leaf constructed from 1.2mm Magnelis® steel skins, folded around a rigid core for maximum impact resistance.
• Acoustic Insulation: Capable of achieving a weighted sound reduction index (Rw) of up to 45dB (with specific infill options), making it perfect for privacy-sensitive areas like offices, meeting rooms, and classrooms.
• Easy Installation: Supplied fully assembled with a unique variable sub-frame and adjustable fixing feet, significantly reducing on-site installation time and accommodating wall tolerances of -0/+30mm.
• Core Options: Standard honeycomb core for lightweight rigidity, or optional mineral wool infill for enhanced thermal and acoustic properties.

Aesthetics & Customisation

Functionality doesn't mean sacrificing style. The Inna-Dor 240 offers a flush, contemporary appearance that integrates seamlessly into modern interiors:

• Durable Finishes: Available in a wide range of Polyester Powder Coated (PPC) colours from the RAL or BS range.
• Woodgrain Options: High-quality PVC laminates available to replicate the warmth and texture of timber while retaining the durability of steel.
• Vision Panels: Optional fire-rated glazing can be incorporated to maintain visibility and light flow without compromising the fire rating.
• Hardware: Supplied with high-quality stainless steel hinges and a range of compatible locking systems, panic bars, and closers to meet specific access control requirements.

Ideal Applications

The Inna-Dor 240 is the preferred specification for a wide range of sectors, including:

• Commercial: Offices, retail outlets, and shopping centres.
• Industrial: Warehouses, factories, and plant rooms.
• Public Sector: Schools, hospitals, universities, and government buildings.
• Residential: High-rise communal areas and secure plant rooms.

The Inna-Dor 240 is a highly versatile internal steel fire door solution, designed to replace traditional timber doors in environments that demand superior fire resistance, durability, and hygiene. Its robust steel construction makes it the preferred choice for high-traffic commercial, industrial, and public sector applications.

Commercial & Corporate

Modern office blocks and corporate headquarters benefit from the Inna-Dor 240’s clean aesthetics and high-performance specification:

• Offices & Meeting Rooms: Provides essential fire compartmentation while offering acoustic privacy (up to 45dB) for sensitive meeting areas.
• Data Centres & Server Rooms: Protects critical IT infrastructure with up to 4 hours of fire resistance, ensuring business continuity.
• Retail Outlets: Ideal for stockrooms, staff entrances, and secure back-of-house areas where security and fire safety are equal priorities.

Industrial & Warehousing

Engineered for tough environments, the Inna-Dor 240 withstands the rigours of daily industrial use:

• Factories & Plant Rooms: The durable Magnelis® steel construction resists impact damage and corrosion, making it perfect for manufacturing zones.
• Warehouses: protects goods and personnel by containing fire spread within large open-plan storage areas.
• Substations & Utilities: Meets strict compliance standards for high-risk utility sectors requiring extended fire ratings (up to FD240).

Public Sector & Institutional

Safety and low maintenance make the Inna-Dor 240 a standard specification for public buildings:

• Healthcare (Hospitals & Clinics): The steel surface is easy to clean and sanitize, supporting strict hygiene protocols in sterile environments.
• Education (Schools & Universities): Designed to cope with high-frequency use in corridors, classrooms, and sports halls.
• Leisure Facilities: Suitable for cinemas, sports centres, and changing rooms where moisture resistance and durability are key.

Residential & Accommodation

• Communal Areas: Provides secure, fire-rated access for corridors and stairwells in multi-occupancy buildings and flats.
• Hotels: balances guest safety with acoustic comfort, ensuring a quiet and secure environment.
• Basements & Garages: Ideal for internal linking doors where fire separation between vehicle storage and living areas is legally required.

Wall Construction Compatibility

The Inna-Dor 240 is certified for installation in a wide variety of wall types, offering flexibility for both new builds and refurbishment projects:

• Masonry & Concrete: Standard installation for maximum structural integrity.
• Flexible Stud Walls (Cold Wall Style): Fully tested for use in drywall partitions, provided the wall reveal is suitably protected (e.g., with fire-resisting board) to support the door under fire conditions.

Specification: Inna-Dor 240

We offer three versions of the Inna-Dor range, each providing specific levels of fire protection (latched or unlatched):

• INNA-DOR 60: Up to 1 hour (60 minutes)
• INNA-DOR 120: Up to 2 hours (120 minutes)
• INNA-DOR 240: Up to 4 hours (240 minutes)

Door Leaf

Production Sizes:
All fire-resistant doors are custom made. NB: Sizes quoted may exceed manufacturing limitations. The maximum size varies according to fire rating as shown below for Mild Steel and 316 or 304 Stainless Steel.

Construction Details:

• Thickness: 54mm
• Material: 1.2mm corrosion-resistant Magnelis® sheets as standard, available in a variety of colours and finishes.
• Infill: Self-supporting resin-impregnated honeycomb core as standard. Optional mineral wool infill available for improved acoustic and thermal performance.
• Construction: Non-welded construction from two skins of Magnelis® folded around a rigid core.
• Special Note: Stainless steel 240-minute fire-rated doors must be fitted with a ‘Z’ and astragal section to form a rebated meeting stile.

Door Frame

• Construction: Folded from 1.5mm Magnelis®.
• Assembly: Screw and tab construction with 4 no. adjustable fixing feet per jamb for easy installation.
• Sub-Frame: Variable sub-frame supplied as standard to accommodate site tolerances of -0/+30mm.
• Hinges: Frame is fitted with 3 no. Class 13 stainless steel hinges with 2 no. dog bolts for enhanced security.
• Profile: Types A & B available in both Inward & Outward Opening versions.

Installation & Assembly

Our Robust steel doorsets are engineered to minimize on-site labour and eliminate the common headaches associated with traditional door installation. Every unit is designed with a "Single Fix" philosophy, meaning the door is supplied as a complete, ready-to-fit system rather than a collection of parts.

Pre-Assembled Convenience

Unlike timber doors that require separate frame assembly, hanging, and hardware fitting, our steel doorsets arrive fully factory assembled. This means:

• Pre-Hung Leaf: The door leaf is already mounted within the frame on high-performance stainless steel hinges.
• Hardware Fitted: Locks, panic bars, and closers are pre-installed and tested in our factory, ensuring perfect alignment and operation out of the box.
• Reduced Downtime: This "plug-and-play" approach drastically cuts installation time, allowing a typical single door to be fitted in less than 60 minutes by a competent installer.

Adjustable Frame System

We understand that structural openings are rarely perfect. Our unique installation system is designed to handle real-world site conditions without the need for excessive shimming or packing:

• Variable Sub-Frame: The frame features an adjustable profile that can accommodate wall tolerance variances of -0mm to +30mm. This ensures a secure fit even in uneven openings.
• Adjustable Fixing Feet: Each jamb is fitted with 4 adjustable fixing feet (8 per doorset). These allow installers to quickly level the frame and secure it firmly into the aperture using the provided 12mm Allen key.
• No Shims Required: The integrated adjustment system removes the need for fiddly packers, creating a cleaner, more solid fixing point directly into the substrate.

Installation Kit Included

To further simplify the process, every doorset comes with a comprehensive installation kit containing:

• 12mm Allen Key: For rapid adjustment of the fixing feet.
• Touch-Up Paint: Matched to your door's colour for covering any minor installation marks.
• Clear Mastic: For weather-sealing external perimeters (where applicable).
• Drill Bits: Specialist bits suitable for concrete or steel fixing, ensuring you have the right tools for the job.

Warranty and Maintenance

Our commitment to quality is backed by comprehensive warranty terms designed to give you peace of mind. The specific coverage depends on the materials used and the installation environment.

Anti-Corrosion Warranty

We offer industry-leading anti-corrosion protection based on the base material and location classification:

• Magnelis® Steel Doors:
  • 10-Year Warranty: For locations classified as C1 to C3 (low to medium pollution/humidity).
  • 5-Year Warranty: For locations classified as C4 (high pollution/industrial/coastal).
  • 3-Year Warranty: For locations classified as C5 (very high pollution/marine).
• Aluzinc Steel Doors:
  • 24-Month Warranty: Standard coverage.
  • Extended Warranty: Available if an enhanced Polyester Powder Coated (PPC) finish is requested and applied.

Please Note: The anti-corrosion warranty applies specifically to the door leaf. Components not manufactured from Magnelis® (such as vision panels, louvre panels, etc.) are excluded unless we are notified prior to quotation and manufacturing, allowing us to offer additional protection for these parts.

Manufacturing Warranty

• All Doorsets: Carry a 24-month warranty against manufacturing defects.

Condition of Warranty

To maintain the validity of all warranties, site maintenance must be carried out at regular intervals as outlined in the Operation & Maintenance (O&M) manual provided with your product.