Outward opening typical maximum sizes: Fixed light: 2500x2500mm, Side hung: 950x1520mm, Top hung: 1300x1650mm.
For sizes beyond this, please speak to a member of our team.
GBS98A
GBS98A has very low U values suitable for ultra-low energy builds including Passivhaus and EnerPHit projects. Our aluminium clad windows enhance the style and design of your project externally whilst maintaining the warmth and beauty of timber from the inside. This frame delivers the triple glazing technology for the most energy efficiency projects. 98 refers to the increased depth of the window frame (before aluminium cladding).
Suited to
Low energy projects
U value
0.73 W/m2K
FSC® certified timber
Choice of design and styles
up to 10 year warranty
Opening functions
Choose from two opening functions for your GBS98A window.
Outward opening
A flush casement window hung from the top or side.
U value
0.73 W/m2K
Light transmission value:
73%
Triple unit
Argon fill 56mm
Glazed?
Triple glazed as standard
WINDOWS HAVE A SIDE HUNG & TOP HUNG OPENING
Inward opening
Tilt and turn window options.
U value
0.72 W/m2K
Light transmission value:
73%
Triple unit
Argon fill 56mm
Glazed?
Triple glazed as standard
WINDOWS HAVE A TILT & TURN OPENING
Inward opening typical maximum sizes: Tilt & turn: 1300 x 2300 mm, Tilt only: 2000 x 950 mm or 1300 x 2300 mm.
For sizes beyond this, please speak to a member of our team
Your windows and doors can be finished in a choice of classic RAL colours or timber stains.
The colours you choose for your window frames and doors can make a big difference to the impact of your project. All products also have the option of dual colour where one colour is chosen for the outside and one for the inside.
Discover our triple-glazed doors, available to make unique to you.
Trickle vents
We promote MVHR when it comes to ventilation, however, if you are unable to accommodate an MVHR system then we can fit conventional trickle vents to your windows. This does affect the thermal performance and airtightness of the window, so please speak to us about ventilation.
Sills
Extensions sills protect and maintain windows by directing water away from the window. We have a variety of aluminium extensions sills ranging in size from 25mm to 380mm. We also have profiles available in Acoya timber. All sills can be colour matched to the window.
Safety
Extensions sills protect and maintain windows by directing water away from the window. We have a variety of aluminium extensions sills ranging in size from 25mm to 380mm. We also have profiles available in Acoya timber. All sills can be colour matched to the window.
We offer a range of glazing options to give you the flexibility you need.
From obscure to transparent, we can offer plenty of choice for window and door glazing. Make your project unique with our various glazing options and glass finishes.
FAQs
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Approved Document Q of the Building Regulations for England became mandatory for all new dwellings on 1 October 2016. This means that windows and doors in new dwellings, where Part Q is applicable, will need to be security tested to PAS 24, or equivalent standard.
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Please contact us for advice on the best range for your project. Or see our summary and overview of the ranges.
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21° windows & doors are all made from timber. Our ranges are made from FSC® certified Redwood or Oak. Modern timber finishes are now so durable that, for most applications, we recommend them over aluminium cladding or UPVC.
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U-Values measure how well heat is transferred by the entire window/ door – the frame, sash and glass – either into or out of the building. The lower the U-Value number, the better the window or door will keep heat inside a building on a cold day.
Download our GBS-98A technical information
Download our technical drawings and UKCA declarations regarding our GBS-98A windows & doors.
Download now
GBS-98A
With FSC® certified timber and low U values, the aluminium clad windows enhance the style and design of your project externally whilst maintaining the warmth and beauty of timber from the inside.
Low U values
Argon-filled triple glazing as standard for comfort and great thermal performance
Airtightness
Dual compression seals ensuring long-term class 4 airtightness
High security
Multipoint locking tested to Secure by Design standard
Be inspired
See our GBS-98A windows for our clients within our case studies.
Certified and quality tested
All of our products are thoroughly tested and quality assured.
FSC Certified Wood
Part Q Compliant
Secured by design
How can we help?
Visit the showrooms
Windows are a big investment, so come and visit our showrooms in Huddersfield and Swindon or catch us at exhibitions around the UK to see our products for yourself.
