Main Office
Dubai — Showroom
The Pinnacle Building, Sheikh Zayed Road, Office 607
Mon–Fri: 9:00 – 18:00
Triple-panel windows
Three fields under one head is how a wide opening gets glazed without any single pane growing past what a crew can lift. The two mullions between the fields carry the wind, and on a run this wide it is their deflection — how far each post bows under pressure before it springs back — that the calculation is really about, because a post that flexes too far pulls its gaskets away from the glass and the window starts to whistle and leak long before anything breaks. The arrangement that suits most rooms keeps the centre fixed for the view and puts the opening leaves on the flanks, within reach and clear of the furniture.
- two mullions what divides the run
- post deflection what the calculation is for
- fixed centre, live flanks usual layout
What a wide run has to answer for
-
Deflection
Mullions
How far a post may bow
-
Reinforced
Posts
Steel where the span asks
-
One level
Sill
Carried the whole way across
-
Thermal movement
Long frames
Metal grows through the day
-
On the flanks
Opening leaves
Within reach, clear of furniture
Let's calculate
the cost of glazing
Get a free calculation for your windows — just leave your number, we'll reply on WhatsApp within 15 minutes.
Why choose aluminium windows?
-
Durable EPDM seals
Three contours of EPDM seals keep the glass off the aluminium and close the gap between sash and frame, so dust, humid salt air and wind-driven rain stay outside.
Learn more -
Foamed thermal inserts
Foamed inserts fill the profile chambers and stop air circulating inside them, so less outside heat and street noise passes through the frame into the cooled room.
Learn more -
Polyamide thermal breaks
Glass-filled polyamide thermal breaks up to 40 mm wide keep the outer and inner shells apart, so the frame holds its shape and its insulation through a UAE summer.
Learn more -
Energy-efficient double glazing
Double glazing up to 60 mm thick puts a sealed gap of still air or gas between the hot street and the cooled room, so less heat crosses the glass into the room.
Learn more
How a three-field window is engineered
- Wind case taken for the actual floor A villa and a tower are different cases
- Mullion spacing set by the calculation Deflection ahead of appearance
- Sill level checked end to end A long run exposes a sloping opening
- Expansion allowed for at the jambs Aluminium moves as the day heats
- Delivered in sections where access asks Joined and sealed in the opening
- Set, sealed and every leaf adjusted Each leaf closed and checked in turn
Examples of solutions
Profile Systems
-
Schuco
Learn more about SchucoSchüco aluminium systems carry large panes on slim frames — for villas, apartments and offices where the view matters.
-
GUTMANN
Learn more about GUTMANNGUTMANN systems are offered by Gutmann Middle East LLC, based in Dubai Investments Park: hinged windows and doors, sliding and lift-and-slide doors, curtain walls and glass railings
-
Deceuninck
Learn more about DeceuninckDeceuninck uPVC profiles are designed in Belgium for superior insulation, weather resistance and a sleek finish. A popular choice for energy-efficient homes across Europe
-
Cortizo
Learn more about CortizoCortizo aluminium systems combine precise Spanish engineering with high thermal and acoustic performance. A reliable choice for windows, doors and facades that need to perform in demanding climates
-
Montana 120
Learn more about Montana 120Montana 120 is a thermal-break sliding series from Gulfex (Gulf Extrusion LLC), with the profile extruded here in Dubai. A straightforward choice for sliding windows and balcony doors of ordinary size
-
TB-600
Learn more about TB-600TB-600 is the thermal-break hinged window and door series of Gulfex (Gulf Extrusion LLC). The profile is extruded in Dubai, and the same maker covers sliding, folding and curtain-wall systems
-
ALUK
Learn more about ALUKALUK is an Italian aluminium systems brand known for slim, minimalist frames that maximise glass area without compromising strength. Perfect for architectural projects that call for a light, contemporary look
-
Vetromax
Learn more about VetromaxVetromax combines advanced glazing technology with aluminium framing for maximum light, strength and energy efficiency. A modern solution for panoramic windows and glass facades
-
REHAU
Learn more about REHAUREHAU uPVC systems are engineered in Germany for outstanding thermal insulation, soundproofing and long-term durability. A proven choice for energy-efficient windows and doors worldwide
The honest downside
Where a three-field window is the wrong fit
Three fields means two posts in the view. On a wall facing the sea or a garden, the mullions are the first thing the eye crosses, and they cannot be thinned past what the wind calculation allows.
The usual layout also puts a swinging leaf at each end of the wall, so both corners of the room have to stay clear of an arc — furniture, curtains, a sofa pulled up to the glass. And the fixed centre, the widest pane, is hard to wash from inside once you are above the ground floor.
Where neither end of the wall has room for a leaf to swing, a sliding window keeps the width usable without anything entering the room. A three-field window stays the practical answer for a wide wall that needs a view in the middle and air from both ends.
Consider instead
Sliding windows
Frequently asked questions
Two reasons, and they point the same way. The middle field is normally the widest, so a sash there would be the heaviest leaf in the window and would swing straight into the path people walk through the room. Leaving it fixed also lets both mullions do their structural work uninterrupted, and puts the handles where somebody standing beside the window can actually reach them.
It is the amount a post bends when the wind pushes on the glass either side of it. Some movement is normal and designed for; too much and the sealing gaskets stop being compressed at the middle of the span, which is where an owner first notices a whistling noise in a strong wind or a damp line after a heavy downpour. Limiting that movement is what sizes the posts and decides whether they need steel inside.
It depends entirely on the route into the room, not on the workshop. A wide frame has to turn a corner in a corridor, clear a lift door or come up a stair, and where it cannot we make it in sections and couple them in the opening with a sealed joint that is designed for it. We check the route at the survey, because finding out on delivery day is a bad way to learn it.
It does, measurably, and a run this wide is where it starts to show. Metal grows as it warms through the day and contracts overnight, so the detail leaves it room to do that at the jambs and at any coupling. Build it tight against unyielding blockwork instead and the frame has nowhere to go: it bows, the sashes stop closing sweetly and the perimeter sealant tears.
Related pages
Nearby pages and the rest of the catalogue.
- Aluminium-wood windows
- Arched windows
- Bay windows
- Casement windows
- Corner windows
- Custom shapes
- Double-panel windows
- Energy efficient windows
- Fire-rated windows
- Fixed windows
- Floor-to-ceiling windows
- Folding windows
Sections
Company
We are always happy to welcome you at our showroom
Showroom
Samples to see in person
Profiles, glass units and hardware to see and touch before you choose.
Dubai — Showroom
The Pinnacle Building, Sheikh Zayed Road, Office 607
Get directions 