Balanced air distribution

AC duct installation in Quwaizah

In Quwaizah, south Jeddah, AC duct installation serves a mix of new and older homes needing efficient air distribution systems. Alrabih's team assesses the site and space before designing ductwork and diffusers for each property.

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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

Quwaizah is a mixed neighbourhood with older villas alongside modern residential buildings, and outdoor spaces vary from site to site. Some older villas were not designed originally for central ductwork, so we may need to reassess interior spaces to find the right duct route. Coastal humidity strongly affects duct efficiency, so thermal insulation is essential here. Airflow balancing requires a careful site visit to understand the room layout and spaces before starting.

Quwaizah is in south Jeddah, a district mixing older villas with modern apartment blocks and varying outdoor spaces.

Older villas here may have window units or separate splits, and central ductwork may need adjustments to interior walls.

The AC setup in Quwaizah

  1. 1

    Central duct with flexible routing

    In older villas, ductwork may need alternative routes through external or side walls instead of traditional paths.

  2. 2

    Foam insulation and strong moisture drainage

    In Quwaizah, every duct is insulated to appropriate thickness, and reinforced drain pans sit under diffusers to handle the high coastal humidity.

  3. 3

    High-efficiency air filters

    Dust and humidity in the area may affect air quality, so we install strong filters in the central unit to protect the system.

Before the visit

Before our visit in Quwaizah

  1. 1

    Prepare electrical and plumbing maps if available

    Gather any drawings showing electrical wiring and pipe locations in walls, to avoid cutting them during drilling.

  2. 2

    Mark interior spaces and possible duct routes

    Tell us the room divisions, ceiling type (false or direct), and any spaces the duct can pass through.

  3. 3

    Inspect roof and outdoor space carefully

    Check roof safety and available outdoor space, and identify the best location for mounting the outdoor unit and pipes.

More districts for AC duct installation

Other services in Quwaizah

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 old villa was not designed for ductwork, can we still fit a central system?

Yes, we visit first to assess interior walls and spaces, then map an alternative duct route that may need limited concrete cutting or adjustments.

The roof is tight and outdoor space is limited, is piping difficult?

In tight areas, we may run pipes through external walls or side walls, and we coordinate with you first to find the best route.

Humidity and dust in Quwaizah may affect the duct, how do we protect the system?

We insulate every duct with foam and fit air filters in the central unit, plus drain pans under diffusers to catch condensation and moisture.

My old villa has electrical wiring and water pipes in the walls, how do we avoid cutting them?

We ask you for maps of wiring and pipes if available, and inspect walls before cutting to identify safe zones for ductwork.

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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