Balanced air distribution
AC duct installation in Al Quraini'yah
In Al Quraini'yah, south Jeddah, duct installation for residential blocks and hospitality properties demands design suited to mixed-use zones and open ground. Alrabih creates a balanced, insulated system that works reliably in extreme heat and humidity.
- Sized branches
- Sealed insulation
- Clean return path
Clients We're Proud to Serve
Organisations and companies that trusted Alrabih with their projects.
When you need a properly designed duct fit
- 1
One room cold, another warm
The unit runs but one room is too warm while the next is too cold. The cause is usually unbalanced branches or a diffuser that was never adjusted, not a fault in the unit itself.
- 2
Moisture and sweating on the ceiling
In Jeddah's humid air, uninsulated cold duct sweats on the outside and water collects on the plasterwork. Proper insulation with Armaflex or Kimmco stops the problem before it damages the ceiling finish.
- 3
Installing a concealed unit in a new build
The right time to fit duct properly is during the fit-out, before the false ceiling closes. We agree plenum dimensions, branch sizes and the return-air route at the survey before any work starts.
Who it's for
Fitting a concealed unit in your new villa
Before the false ceilings close, we design the plenums, branches and return-air route to suit the unit and each room in the villa.
Ask on WhatsAppSweating ceiling and uneven airflow in your building
We inspect the existing branches and return-air path, re-insulate the cold duct, and set the dampers so temperature evens out across every section of the building.
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What the duct installation covers
- Supply and return plenums
- Sized branch to each room
- Armaflex or Kimmco insulation
- Diffuser balancing with dampers
- Airflow check before ceiling closes
How we work
How we work
- 1
Site and unit survey
We measure the rooms and study the unit's data and plenum spec, and we settle the return-air route before deciding on branch sizes.
- 2
Design branches and plenum
We size each branch so it takes the right share of air without starving rooms farther from the unit, and we plan a return path with a correctly sized intake opening.
- 3
Fit and insulate
We fix the plenums and branches using SMACNA-standard duct, then insulate every cold surface with a sealed layer that stops sweating in Jeddah's high humidity.
- 4
Balance and hand over
We set each diffuser damper and check airflow in every room with you before the false ceiling is closed, then leave the site clean.
Designed duct or just connected duct?
| Alrabih | The usual way | |
|---|---|---|
| Branch sizing | Calculated per room | Connected without sizing |
| Return air | Routed with a sized intake | Left to chance |
| Duct insulation | Sealed against sweating | Thin or absent |
| Diffuser balance | Damper set per room | All diffusers fully open |
| Pre-closure airflow check | Done with you before closing | Faults found after ceiling closes |
Everything your AC needs, from one team
From system design and duct fabrication to installation, commissioning and maintenance.
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Some of our work
Ductwork, rooftop units and diffusers, from work we've completed in Jeddah.
Customer reviews
What our customers say
- Muhammadramzan 2641
“MashaaAllah. Services are so good. Behaviour and kindness 100/100. Prices are less then Market. Fully recommended”
- shahzeb armani
“Wow. Prices are so comfortable. Outstanding services. People are so talented and nice”
- Tawfik AlyawerLocal Guide
“U can find all u need for air conditioning”
Your satisfaction matters to us! If you had a great experience with us, we'd love a 5-star rating and a kind review.
Worked with us? Leave a reviewService areas
We come to you anywhere in Jeddah
From Al Shiraa and Al Yaqout in the north to Al Thaghr and Al Quraiyat in the south, with our base in Al Aziziyah.
What sets this district apart
Al Quraini'yah is a mixed-use southern zone with multi-storey apartment blocks, villas, and some hospitality and commercial properties, interspersed with open ground. Extreme heat and direct sun exposure on roofs mean uninsulated duct will lose most cooling before reaching rooms, and moisture from the sea makes condensation a real danger in ceilings. Proper ductwork design calls for heavy insulation, balanced branches, and precise calculations per floor or unit.
Al Quraini'yah sits in south Jeddah, a mixed-use zone of apartment blocks, villas and commercial properties with open ground between them.
Buildings here vary in height, some reaching 10 storeys or more, with roofs fully exposed to fierce sun, and outdoor units are mounted on rooftops or spacious yards.
The AC setup in Al Quraini'yah
- 1
Sealed vertical duct for tall blocks
Multi-storey buildings need sealed central vertical duct with horizontal branches per floor and pressure-control dampers on each.
- 2
Heavy insulation against intense heat and humidity
60 mm high-density foam insulation with drainage ports protects against cooling loss and condensation on fully exposed roofs.
- 3
Reflective shield for sun-exposed sections
Upper duct sections on roofs may need reflective coating or metal shield to reduce direct solar heat absorption.
Before the visit
Before our visit in Al Quraini'yah
- 1
Inspect high roofs and vertical runs
Before we visit, confirm the roof is safe and the roof stairs can support our team, and mark the vertical duct routing.
- 2
Coordinate with building management or owner
If it is a large residential block, notify building management of installation dates and request access to the roof and common areas.
- 3
Verify the main electrical circuit is adequate
Check the main electrical panel and tell us the condition of wires and breakers, and whether there is room for a new connection.
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FAQ
Questions about AC duct installation
Why does duct in Jeddah sweat more than elsewhere?
Jeddah's outdoor air carries high moisture because of its coastal location. When that air touches a cold duct surface, the moisture condenses immediately. Insulating with a thick enough layer of Armaflex or Kimmco, with all joints sealed, raises the outer surface temperature above the dew point and stops the sweating.
Does a longer branch deliver less air to the room?
Yes, a longer branch resists airflow more than a short one. This is why we size each branch individually, so near and far rooms receive balanced quantities of air, and we complete the adjustment with dampers during start-up.
How do you size the return-air opening?
The intake opening must be large enough so the unit does not work against negative pressure that strains it. We check the unit data and plenum requirements and decide size and position at the survey, because placing it behind a closed door or away from occupied areas changes the calculation.
Does a large room need more than one air outlet?
Usually, yes. A long majlis or a wide living room cannot be served by one outlet, because the air cools one end and leaves the other. We spread the outlets along the room, split the branch between them, and keep them away from the return grille so cool air does not go straight back to the unit.
Does the duct material affect sweating and airflow balance?
Yes. Sheet metal duct holds its shape under air pressure, so flow quantities stay as designed. Flexible duct can compress or sag, changing its cross-section and upsetting the balance. We therefore fabricate the main branches from galvanised sheet in our workshop and use flexible duct only for the shortest possible connection at each diffuser.
Buildings here are tall multi-storey blocks; how do you balance duct from ground to tenth floor?
We calculate pressure and heat loss through each floor, and fit adjustable dampers on each floor's branch to ensure even distribution from ground to top.
The sun on the roof is extremely intense; is insulation alone enough?
We insulate with 60 mm high-density foam, and may add reflective heat shield to roof-exposed sections to reduce solar absorption.
Coastal humidity causes heavy condensation in high ceilings; how do you protect the duct?
We insulate the cold duct with 60 mm foam and fit drainage holes at low points in the duct so water does not accumulate inside.
The outdoor unit sits on a high roof; what are the electrical requirements?
We check the electrical circuit from the main panel and verify it can handle the long cable run and high load, consulting the electrician if wiring or breaker upgrades are needed.
