Balanced air distribution
AC duct installation in Al Rawasi
In Al Rawasi, east Jeddah, AC duct installation in villas and retreats requires adaptable systems because buildings are spread across large plots with high ceilings and diverse room layouts. Alrabih designs duct to convey cold air across long runs whilst maintaining even pressure in every room.
- 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 Rawasi is a district of villas and retreats on relatively spacious plots with high ceilings, multiple rooms and wide spacing. This means duct needs robust calculations for long runs and multiple branches, with each branch requiring proper diameter to prevent pressure loss. Humidity in Al Rawasi is high because it sits near the eastern coastal zone, and insulation must be excellent on all cold pipe. Balancing outlets demands precise adjustment because distances from the unit vary widely, and high ceilings provide good duct routing space but may need higher-capacity central units.
Al Rawasi is in east Jeddah, a district of villas and retreats on spacious plots with high ceilings and widely spaced rooms.
Most villas and retreats here use one or more central units, with duct extending in long branches across high ceilings to cover all wings and rooms.
The AC setup in Al Rawasi
- 1
One or two central units with extended duct
Large villas may need one long-duct unit or two separate units per wing, depending on room distribution and spacing.
- 2
Graduated duct diameters for extended runs
Each duct branch needs a diameter matching its distance from the unit, ensuring even distribution without pressure loss.
- 3
Very thick insulation to prevent heat loss
Long runs and high eastern humidity demand very thick insulation on all cold pipe to retain cold and avoid condensation.
Before the visit
Before our visit in Al Rawasi
- 1
Study the full villa layout and distances
Get an architectural plan showing all wings, rooms and spacing so we can decide whether one unit or more is needed.
- 2
Mark central unit location and outlets
Agree with the villa owner on the best central unit location and outlet positions in each room and wing before duct design starts.
- 3
Confirm access to ceilings and passages
Verify that high ceilings are safe to access and that hallways and routes are clear for running duct without obstacles.
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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.
My villa is huge with distant wings, does one unit suffice?
One unit may suffice if wings are relatively close, but if they are far apart we may recommend a second unit to ensure even distribution without pressure loss in distant branches.
Duct runs long distances across high ceilings, how do you preserve the cold?
We insulate all cold duct heavily to prevent heat loss across long runs, and select proper diameters for each branch to minimise pressure drop.
Does eastern Al Rawasi humidity affect duct and outlets?
Yes, humidity is very high, so we insulate all cold pipe heavily and carefully to prevent condensation, and ensure any moisture collects and drains safely.
Rooms far from the unit run cooler, how do you balance the distribution?
We examine each duct branch and adjust its damper based on distance from the unit, using graduated diameters to ensure cold air reaches every room at consistent velocity.
