Robust inna dor 120 steel fire rated steel doorsets

Inna-Dor 120 - 2 Hour Fire Doorset

The Inna-Dor 120 is a premium made-to-measure steel doorset, engineered specifically for internal applications requiring substantial fire resistance. Fully tested to BS 476 Parts 20 & 22 and BS EN 1634-1, this door offers a certified fire rating of up to 2 hours (120 minutes), making it a critical component in any building's passive fire protection strategy.

Designed to seamlessly replace traditional timber fire doors, the Inna-Dor 120 combines the superior durability of steel with a refined aesthetic. It is ideal for separating higher-risk areas such as commercial kitchens, archives, and server rooms from main escape routes, ensuring that fire and smoke are effectively contained for an extended period.

Key Features

• Verified Fire Performance: Certified for up to 120 minutes of fire integrity (FD120), suitable for both latched and unlatched configurations.
• Superior Construction: Manufactured from 1.2mm corrosion-resistant Magnelis® steel, which provides up to 10 times better corrosion resistance than standard galvanised steel.
• Acoustic Insulation: Capable of achieving a sound reduction index of up to 45dB (with specific infill options), offering excellent privacy for offices and educational spaces.
• Custom Fit: Each doorset is custom-manufactured to your exact opening dimensions, ensuring a perfect fit and maximum performance.

Technical Specification

Installation & Versatility

The Inna-Dor 120 is designed for ease of installation and operational flexibility. It features a unique variable sub-frame that accommodates site tolerances of -0/+30mm, significantly reducing installation time. The door is suitable for installation in:

• Masonry & Concrete Walls: Standard fixing for maximum rigidity.
• Flexible Stud Walls: Compatible with cold wall style partitions (requires fire-resistant boarding on the reveal face).

The Inna-Dor 120 (FD120) occupies a critical "sweet spot" in fire protection, bridging the gap between standard compliance and extreme hazard mitigation. While 60-minute doors suit most offices, and 240-minute doors are for bunker-like protection, the 120-minute rating is the essential standard for high-value asset protection and critical infrastructure separation.

High-Risk Commercial Zones

In large commercial complexes, standard fire doors often fall short of insurance and safety requirements for specific high-risk zones. The Inna-Dor 120 is specifically engineered for:

• Server Rooms & Data Centres: Providing a mandatory 2-hour burn time allows for the complete activation of gas suppression systems and protects irreplaceable digital assets from external fire spread.
• Commercial Kitchens: acting as a robust barrier between high-heat cooking environments and public dining areas or escape routes.
• Document Archives: Essential for legal firms, banks, and government buildings where physical records require extended protection times beyond standard evacuation needs.

Industrial & Utility Infrastructure

For industrial settings, the Inna-Dor 120 offers the perfect balance of weight, usability, and protection:

• Plant Rooms & Boiler Houses: Often legally required to have 120-minute separation from the main building structure due to the higher risk of intense fires.
• Chemical Storage: Provides the necessary containment time for hazardous materials storage areas where standard 60-minute doors would fail too quickly.
• Substation & Switch Rooms: Meets the specific DNO (Distribution Network Operator) requirements for many internal substations located within larger commercial buildings.

High-Rise & Multi-Occupancy

As building heights increase, so do evacuation times. The Inna-Dor 120 is a vital component in modern high-rise strategies:

• Stairwell Enclosures: protecting the primary escape route for longer periods in buildings exceeding standard height limits (typically 18m-30m+).
• Lift Lobbies: creating a secure "airlock" that prevents smoke and fire from using lift shafts as chimneys, a critical requirement in deep-plan buildings.
• Communal Fire Doors: In high-rise residential blocks, FD120 doors are often specified for cross-corridor separation to create effective progressive evacuation zones.

Why Choose Steel for FD120?

While timber doors can achieve a 120-minute rating, they often require excessive thickness (64mm+) and weight to do so. The Inna-Dor 120 achieves this protection with a slimmer 54mm profile that is significantly more durable:

• Traffic Resilience: Unlike timber, the steel construction effectively resists damage from trolleys and heavy footfall, which would otherwise compromise the fire integrity of a wood door.
• Hygiene & Maintenance: The smooth steel surface is impervious to moisture and bacteria, making it superior for hospitals and food production areas where deep cleaning is routine.

Specification: Inna-Dor 120

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, ensuring superior performance compared to galvanised steel. Available in a variety of colours and finishes.
• Infill Options:
  • Standard: Self-supporting resin-impregnated honeycomb core.
  • Mineral Wool: Available for improved thermal performance and acoustic reduction.
  • Timber Core: Available for added strength and reinforcement.
• Construction: A non-welded construction from 2 skins of Magnelis® folded around a rigid core.
• Meeting Stile: Stainless steel 240-minute fire-rated doors must be fitted with a ‘Z’ and astragal section to form a rebated meeting stile.

Door Frame & Installation

• Construction: Folded from 1.5mm Magnelis®.
• Assembly: Screw and tab construction with 4 no. adjustable fixing feet per jamb for easy installation.
• Single Fix Design: Supplied fully assembled with hardware fitted, reducing installation time and providing significant cost savings compared to timber doors.
• 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.