Balanced air distribution
AC duct installation in Al Surur
In Al Surur, south Jeddah, installing central ductwork for villas and apartment blocks requires design that matches intense heat loads. Alrabih designs fully insulated duct to prevent leaks and condensation, and balances distribution to 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 Surur is a developing residential zone with spaced villas and modern apartment blocks, with reasonable green spaces and regular streets. Most modern buildings here are equipped with false ceilings and wall cavities suitable for a complete duct system. However, its location further from the coast in southern Jeddah means intense direct sun and ground heat reflection, significantly raising heat load, so the duct demands precise insulation and tight hydraulic balance.
Al Surur in south Jeddah is a growing residential zone with modern villas and apartment blocks and regular streets.
Most central units here need heavily insulated duct to withstand the intense heat typical of south Jeddah.
The AC setup in Al Surur
- 1
Multi-storey duct system for spacious villas
Large villas in Al Surur need duct networks spanning multiple storeys with balance branches for each floor.
- 2
Heavily insulated central duct in apartment blocks
Al Surur's intense heat load requires thick, high-quality duct insulation in every apartment block.
- 3
Protecting outdoor units from direct heat
Outdoor units on rooftops need protective canopies and extra duct insulation to reduce heat-load impact.
Before the visit
Before our visit in Al Surur
- 1
Measure the building's heat load
Prepare information on window count, sun exposure and exterior colours to help us calculate heat load accurately.
- 2
Identify safe unit placement
Choose a sheltered spot for the outdoor unit if possible, or prepare a protective canopy, and decide on the indoor unit location in the villa or flat.
- 3
Confirm electrical capacity
Check the main electrical panel's capacity, as large central units need a dedicated circuit and sufficient power supply.
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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.
Al Surur is hotter than the northern districts, does that affect central unit sizing?
Yes, significantly. Heat load is higher here due to location and direct sun exposure. We size the unit based on that, never underestimating.
The duct loses coolness before reaching the last room, why?
If duct insulation is inadequate, intense heat draws the cool away. We insulate the full duct run with thick, high-quality material and balance branches to ensure even cool air reaches every room.
My villa has three storeys, how do you balance air evenly?
We install one central unit with a multi-storey branch system and fit dampers to balance air between floors based on each level's heat load.
The outdoor unit gets direct sun, does it need extra protection?
Yes, we recommend installing a protective canopy above the outdoor unit and apply extra duct insulation to the external run to reduce heat absorption.
