Fort gdo pro 51mm chester vertical standard rib with window ral colours steel side hinged garage doors

Subtle Elegance with Natural Light Integration

The ProTherma 51mm Chester Vertical Standard Rib with Window steel side-hinged garage door features the Chester window configuration with standard-width vertical ribs, offering a more subtle, refined appearance compared to the medium rib variant. The narrower ribs create a more delicate visual texture whilst maintaining the classic windowed-door aesthetic. The door is available in an extensive range of RAL colours to perfectly match your home's exterior colour scheme.

Identical window positioning to the Chester range provides excellent natural light at the top section of each leaf. The standard rib panels below complement the glazing with their more refined, narrower profile, creating an elegant, less imposing overall appearance. This design works particularly well on properties where a less dominant door presence is desired, or where architectural detailing tends toward the subtle and sophisticated, whilst the 51mm double-skinned insulated steel construction ensures outstanding thermal performance.

Advanced 51mm Insulated Construction

Manufactured using Fort's premium ProTherma 51mm insulated panel system, this door combines a robust 51mm double-skinned outer aluminium frame profile with steel insulated panel inserts and integrated window frames. The advanced polyisocyanurate (PIR) thermal core delivers industry-leading insulation performance with a U-value of 1.4W/m²K. The standard vertical rib profile provides subtle texture whilst the integrated windows transform your garage into a more usable, pleasant space with natural illumination.

Security Features and Hardware

The Fort ProTherma 51mm range incorporates advanced security features as standard. A 3-point locking system with mortice lock and twin hook bolts provides secure multi-point engagement, whilst the 3-star anti-snap euro profile cylinder resists attacks. Concealed shoot bolts on the inactive leaf prevent forced opening. The robust lever handle features internal thumb-turn operation. Door stays are fitted as standard. Optional smart access systems available.

Configuration and Finish Options

Available in 50/50 split or 1/3 - 2/3 split configurations. Windows feature frosted or textured glazing for privacy. Choose from 32 powder-coated RAL colours including Pure White (RAL 9010) and Anthracite Grey (RAL 7016). Double weather seals and a thermally broken threshold ensure maximum thermal performance. External hinges are 3D adjustable. Supplied made-to-measure as pre-assembled doorsets. Manufactured in the UK with a 10-year warranty. 

Summary of main door features:

Insulated steel side hinged doors for use as a garage door or light commercial applications where insulation is required. Security is high as standard along with the robust panel construction.
Ideal for any garage or workshop which is heated and would benefit from insulated doors too.

Choose from 32 standard colours which also includes the outer fixing sub frame. 3 colours are standard with no charge and the optional 29 other colours have a small additional charge

Optional RAL special colours are always available on request.

9 different lever handle finishes are available at the same price or choose a chrome finished smart lock system at extra cost allowing finger print recognition for entry. This system is in a chrome finish as standard.

Roller bar locking and fixed straight vertical pull bars in stainless steel are available externally in 1200mm or 1600mm lengths at extra cost.

50:50 door split
1/3rd and 2/3rd split optional with limited maximum width sizes of 2438mm
Minimum width for doors is 1500mm overall
Minimum height for doors is 1500mm overall

Doors open outwards as standard but on request you can have the door opening inwards at extra cost in manufacturing. The seals will not perform as well with the doors opening inwards.

Included as standard:

Door stays operated from inside
3 star anti snap locking
3D adjustable hinges
Outer fixing sub frame in aluminium box section with multiple seals
Concealed shoot bolts top and bottom of inactive door leaf
3 point mortice and twin hook locking

These side hinged doors have been designed as most other preassembled side hinged doors we offer online with all the relevant parts already pre fitted in the factory process. The doors are delivered to you as a complete assembled doorset ready to install.

Installation instructions can be found to the left hand side in our downloads section.
Simply offer the doors with their prefitted fixing sub frame into the opening and secure the fixing frame and adjust levels in the process with the 3d hinges fitted and adjustable locking
A level floor is essential for the best results and a square aperture also makes installation easier but there are adjustments all round and in all directions.
 

The standard guarantee of 2 years is given to the holder of the product that covers all parts and the door panel, providing the serial number is readable, intact and in place. Factory applied paint finishes are 2 years on steel doors that have standard colours applied.

The product is given a 2 year warranty for hinges and locking for normal use whereby normal use consists of no more than 5 operations (open/close) per day. We recommend the product is inspected and serviced annually by a competent engineer from the garage door industry, the warranty for parts replaced by an engineer or for supply only is 6 months or for the remainder of the warranty period. If warranty work is carried out the product guarantee does not extend past the anniversary of installation/ supply date.