glass doors on commericial building
ALUK logo white aluk logo

GT55 Aluminium Commercial Doors

GT55 commercial doors from AluK are designed to maximise security. PAS 24 rated and Secured by Design accredited, they will protect the interior of any commercial property from forced entry attempts. Available as a single or double door, they are a popular choice for installations in hospitals, schools, offices, and all types of heavy-duty commercial applications.

  • Mechanical and electro-mechanical locking systems
  • Thermally broken profile
  • Anti-finger trap styles
  • Angular corner feature designs
  • Glazed or non-glazed options
Get a Trade Quote

Product features

Design features

AluK GT55 aluminium commercial doors are available in a range of configurations to suit a wide variety of commercial applications. They can be used in conjunction with additional screening, fan lights and side lights, and can incorporate high-tech panic locking systems to enhance security. Standard or DDA complaint overhead closers are available and the doors can be glazed or non-glazed to improve natural light or enhance privacy levels.

Product options

  • 110mm system depth
  • Maximum door leaf weight 110kg
  • 24mm – 40mm glazing thickness
  • Multi-point locking
  • Low threshold
  • Class 1A water tighness
  • Class 1A water tighness
  • Class 0 air tightness
  • U-values as low as 1.82 W/m²K (double glazing)
  • U-values as low as 1.62 W/m²K (triple glazing)
  • Optional panic bar


U-Value Double Glazing (ug: 1.0 W/m²K)

U-Value Triple Glazing (ug: 0.7 W/m²K)

Air permeability

Water tightness

Wind resistance

Durabllity EN 1191 Category


3rd Party Certification Q-Mark

System depth - Units (mm)

Maximum door leaf size

Maximum door weight

Single glazed

Double glazed

Single colour

Dual colour

Textured finish

Anodised finish

Thermally broken

Fire exit option

Part M compliant low threshold

Part M compliant closer

Anti-finger trap


Mid-Rail and Lay Bar

Panel door

Multi-point locking

Single-point locking

Concealed hinges

Barrel hinges

Electro mechanical locking

New build - Residential

New build - Commercial


Heavy commercial


1.9 W/m²K

1.7 W/m²K




50,000 Cycles

PAS 24 & SBD


1250 w x 2400 h



24mm - 40mm



1.8 W/m²K

1.6 W/m²K




50,000 Cycles

PAS 24 & SBD


2500 w x 2400 h



24mm - 40mm


GT55 TB Screening

1.3 W/m²K

1.1 W/m²K

Class 4 (600 Pa)

Class E1200 (1200 Pa)

Class B4 (1600 Pa)


PAS 24 & SBD




6mm - 12mm

24mm - 30mm












Super secure aluminium commercial doors

AluK GT55 TB commercial aluminium doors incorporate a range of high security features into their design. From mechanical and electro-mechanical locking systems to multi-point locking systems and anti-panic bars, they are designed to prevent any forced entry attempts to keep any commercial premises safe and secure. In terms of appearance, they can be specified in a range of styles and configurations. They can also be powder coated in any of over 200 RAL colours for the ultimate in bespoke customisation.

glass security doors on commercial building

Frequently Asked Questions

Can’t see the answer you’re looking for? View more answers here.

Contact Us

What are your lead times?

Lead times can vary per product. For stock PVCu colours we work to a 10-15 working day schedule. For more up to date lead times on any specific product e-mail us at where we will be happy to help.

Are your products compliant with new building regulations?

Our Eurocell PVCu range of products are fully compatible with all new build regulations. Quantum Windows has a number of secured by design certifications to provide you with peace of mind and our quality systems in place are all aimed at producing a quality product first time, every time.

Currently, our range of Aluminium double glazed Aluk 58BW HI Windows, Aluk 58BD HI Residential doors, EdgeGLIDE+ Sliding door and Unifold HI all have a U-value of 1.4 or below and are compliant with new building regulations. Our range of compliant products is always growing, so please give us a call for the most up to date information.

Please note that you will need to specify on your enquiry if you need your product to meet the new building regulations.

Where do you deliver to?

We deliver weekly to the West Midlands, Derbyshire, Leicestershire, Warwickshire, Oxfordshire, Berkshire, Surrey, West Sussex, East Sussex, Kent, Greater London, Hertfordshire, Essex, Suffolk, Cambridgeshire, Bedfordshire, Buckinghamshire. Norfolk and of course Northamptonshire.

aspects white open bi fold doors

I have been buying windows and doors from Quantum Windows for over 25 years. I have always found the pricing very competitive and the quality has been very high. On the rare occasion a problem has arisen it has been dealt with swiftly and efficiently. The office staff are always polite, friendly and professional and we have built a strong relationship over the last 25 years. The drivers are excellent. I know them very well and they have adapted to my ways of working and are always willing to help and accommodated me.

Craig Gutteridge

“We have dealt with Quantum Windows for 13 plus years, we find the staff to be courteous and polite and any queries we may have are dealt with promptly and efficiently, nothing is too much trouble”

Jackie - Accounts Dept

W R Enterprise Glass & Glazing Ltd.

We have been buying from Quantum Windows for almost 30 years now, they offer a wide product range and the Team have excellent product knowledge which is invaluable in an ever-changing market.

All team members are friendly, helpful and efficient, orders are processed with care and quotations provided promptly. I would have no hesitation in recommending Quantum Windows.

Vicki Webb

Clearview 2000 LTD

‘We have used Quantum Windows for many years now, we have always found them to be very easy to work with, the staff are all very helpful and friendly, they are always available to offer any help should we need it, excellent product!’


Chapel Windows

Glevum and Quantum have enjoyed an excellent working relationship for a number of years, working together to provide a high quality, value for money product offering and service for the end user.

As well as delivering a high quality product, the knowledge and experience of the staff at Quantum is invaluable to a customer in a market where Building Regulations are constantly changing.

Mike Donaldson

Glevum Design & Build

As installers of both PVCu and Aluminium to the New Build market, the importance of on time delivery is totally time critical.
Over the last 20 years Quantum windows have worked closely with PGB to partner with us and deliver our offer to site.
Highly professional, and a pleasure to have worked with them so closely over the years.

Phil Martin CEO

Portico CB Ltd

Click here for a trade quote