Balanced air distribution
AC duct installation in Al Sharafiyah
In Al Sharafiyah, central Jeddah, duct installation in modern villas and apartment blocks needs careful branch and diffuser planning. Alrabih sizes the plenum and ducts to match the unit, insulates against condensation in Jeddah's humidity, and balances airflow at every outlet.
- 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 Sharafiyah's relatively modern buildings mix spacious villas with multi-storey apartment blocks, and their large interior spaces need even air distribution from main rooms to remote corners. This building type benefits from concealed ducts for aesthetic and efficiency reasons, but it requires precise calculations to ensure cold air does not condense on the duct walls because of the high coastal humidity.
Al Sharafiyah lies in central Jeddah, a relatively modern residential area mixing large villas with apartment blocks.
Most projects here use one or more central units with concealed ducts covering separate floors or wings.
The AC setup in Al Sharafiyah
- 1
Central duct for spacious villas
Modern villas in Al Sharafiyah usually need one central unit with concealed ducts covering all ground and upper floor rooms.
- 2
Separate system per wing in apartment blocks
Apartment blocks need a separate duct system per floor or wing because of the division between residential units.
- 3
Ducts insulated against condensation
All duct runs are insulated with at least 50 mm insulation to prevent vapour condensation in Jeddah's humid climate.
Before the visit
Before our visit in Al Sharafiyah
- 1
Provide architectural plan or villa photos
Clear photos of the floor plans and elevations help us design the duct run precisely before the site visit.
- 2
Confirm preferred outdoor unit location
Tell us whether you prefer the outdoor unit on the roof, beside the villa, or in the garden, as this affects the copper line length.
- 3
Ask about the concealed duct routing
Check whether the duct can pass through suspended ceilings or internal walls, and let us know of any electrical or plumbing obstructions in advance.
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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 large with distant corners, how do you ensure even cooling throughout?
We calculate the plenum and branch sizes based on the unit's capacity, and balance the air at each diffuser so that distant and nearby rooms receive equal cooling.
My villa's entrance is narrow, how do you bring the duct materials in?
We bring duct in sections and assemble it inside the villa, and we agree on the best entrance route before starting work.
Humidity in Jeddah is high, does the duct need to be insulated?
Yes, insulation is essential to prevent water condensing on the duct walls and damaging the surrounding walls and ceilings.
Does the outdoor unit need to be close to the central duct location?
Not necessarily, but distance affects the copper line run and installation cost, and a site visit determines the best location for both the unit and the plenum.
