Balanced air distribution

AC duct installation in Al Sahil

In Al Sahil, south Jeddah, duct installation in modern villas requires precise planning because concealed units cover large areas. Alrabih sizes the ducting and branches to match the unit's capacity and balances the airflow so every room cools evenly.

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  • Sized branches
  • Sealed insulation
  • Clean return path

Clients We're Proud to Serve

Organisations and companies that trusted Alrabih with their projects.

  • Saudi Aramco
  • Ministry of Energy
  • Royal Saudi Land Forces
  • Royal Saudi Naval Forces
  • Al Baik
  • Centro Hotels by Rotana
  • King Abdullah Economic City
  • First Mills
  • Juffali
  • eXtra
  • Dr. Soliman Fakeeh Medical Center
  • Alesayi Motors
  • Abu Zaid
  • Water Desalination
  • Attieh Steel
  • SSCO
  • Creet
  • Emad Rizq
  • Alfaneyah
  • Rawat Alam Al Tasmeem
  • IBI Magix Arabia — Construction Services
  • Midtown for Construction
  • Petra Engineering Industries Co.
  • Hyrmas
  • Batterjee Medical College
  • Advanced Horizons Contracting Company
  • D.Metals
  • Benchbox — Masters of Space
  • Sadafco
  • Umm Al-Qura University
  • Saudi Arabian Drug Store (SADS)
  • Foamco
  • Ahmad A. R. Bin Afif Industries Co. (Sandwich Panel Factory)
  • Namariq
  • ALS

When you need a properly designed duct fit

  1. 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. 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. 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.

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  • Sweating 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
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How we work

How we work

  1. 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. 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. 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. 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?

AlrabihThe usual way
Branch sizingCalculated per roomConnected without sizing
Return airRouted with a sized intakeLeft to chance
Duct insulationSealed against sweatingThin or absent
Diffuser balanceDamper set per roomAll diffusers fully open
Pre-closure airflow checkDone with you before closingFaults found after ceiling closes

Everything your AC needs, from one team

From system design and duct fabrication to installation, commissioning and maintenance.

Some of our work

Ductwork, rooftop units and diffusers, from work we've completed in Jeddah.

  • Galvanized rectangular duct trunk with branch takeoffs and round diffusers, hung from a black ceiling, a Carrier unit visible behind — interior finishing stage.
  • Round diffusers and a spiral duct trunk in a tiled stairwell service shaft.
  • Rooftop ductwork and an exhaust fan, with Jeddah buildings in the background.
  • Rooftop packaged AC units with rectangular duct transitions, city buildings behind.
  • Insulated rooftop duct run beside a packaged unit, a warehouse roof in the background.
  • A grid of round diffusers in an open-plan office ceiling, mid-construction.
  • An insulated rooftop duct elbow, against a mountainous backdrop.
  • Large insulated ductwork running along a factory ceiling, with workers visible below.
  • A yellow round diffuser mid-installation, with spiral duct and a suspended ceiling grid.
  • Duct insulation wrap in progress on a construction site, bare duct still exposed.
  • A black-painted duct trunk with round diffusers and track lighting, in a finished retail interior.
  • An indoor AHU unit connected to round ductwork in a mechanical plant room, exposed concrete ceiling.
Similar project? Send us the details

Customer reviews

What our customers say

4.8

From 10 Google reviews

  • 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”

Read every review on Google

Your satisfaction matters to us! If you had a great experience with us, we'd love a 5-star rating and a kind review.

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Service 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.

Map of Jeddah by sector, with Alrabih's base in Al Aziziyah
Don't see your district?Message us. We most likely cover it.

What sets this district apart

Al Sahil villas are relatively modern and spacious, relying on central AC to cover two or more storeys. Ducts run through suspended ceilings and internal walls, and in the humid coastal climate, the cold ducts must be carefully insulated to stop moisture condensing on the outside. Unbalanced airflow leaves some rooms too cold and others warm, so we adjust the diffusers in each room to achieve full balance.

Al Sahil sits on the beach south of Jeddah, an area of spacious modern villas away from the commercial centre.

Most Al Sahil villas have concealed units of medium to high capacity, with ducts running through suspended ceilings and floors across storeys.

The AC setup in Al Sahil

  1. 1

    Central system with insulated ducts

    Modern Al Sahil villas need carefully insulated ducts to avoid heat gain and moisture condensation across the long runs from the unit to the diffusers.

  2. 2

    Horizontal and vertical branches across floors

    Main ducts run horizontally in the suspended ceiling of the ground floor, then branch vertically upward to cover the first and second floors completely.

  3. 3

    Multiple air handlers in a single unit

    Some larger villas need more than one air handler to balance pressure and flow across distant zones.

Before the visit

Before our visit in Al Sahil

  1. 1

    Bring the villa's floor plan or a detailed layout description

    We need precise details of room count, total area and ceiling height to calculate duct sizes and branches accurately.

  2. 2

    Confirm space for the outdoor unit and suspended ceilings

    Tell us where the outdoor unit will go and confirm the suspended ceilings are high enough to accommodate the main ducts and insulation.

  3. 3

    Check existing wiring and piping in ceilings

    Before the visit, get details of where electrical wiring and water pipes run in the ceilings to avoid any conflicts with duct placement.

More districts for AC duct installation

Other services in Al Sahil

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.

How do you ensure even cooling across my large villa?

We size the main ducts and branches to match the unit's capacity and room type, then manually adjust each diffuser to balance pressure and flow across the zones.

The coastal humidity affects cold ducts, how do you protect them?

We insulate all cold ducts with sufficient thickness to prevent moisture condensing on the surface in the humid coastal climate.

Do the ducts run through suspended ceilings without electrical issues?

We check the layout of wiring and pipes before installation, avoid any dangerous crossings, and document the duct positions in the final diagram.

The villa is new and construction is not finished, can we install ducts now?

Yes, we prefer installation during construction before walls and ceilings are finished, so the ducts are neatly and safely concealed.

The Jeddah corniche in cool weather

Get even airflow in every room

WhatsApp a photo of the floor plan or site and your unit details, and we will book a survey in your district, Saturday to Thursday.

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