Desert cooler, proper duct

Evaporative (desert) duct installation in Al Mahamid

In Al Mahamid, east Jeddah, evaporative duct installation suits dense commercial and residential buildings. Alrabih balances limited space with the need for effective air distribution across multiple floors.

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  • Sealed roof
  • Galvanised duct
  • Air changes

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 evaporative cooler duct

  1. 1

    A large workshop or warehouse

    Large industrial spaces get very hot in Jeddah summers and split units are expensive to run there. An evaporative cooler with distribution duct brings air to work areas at lower running cost, provided the space is ventilated and not sealed shut.

  2. 2

    A majlis tent or seasonal space

    Outdoor majlis areas and seasonal tents do not suit split AC units because of the structure. Evaporative duct delivers a cool air stream as long as the space is open enough for air changes, which the survey confirms.

  3. 3

    Old duct with poor airflow

    Old sheet duct cracks over time and air leaks from the joints before reaching the space. On site we check whether the problem is leaking duct, poor distribution, or the cooler size itself.

Who it's for

  • Need to cool a large workshop at reasonable running cost

    We survey the workshop and check its ventilation, then run galvanised duct from the roof cooler to the work areas with exhaust openings that keep air moving through the space.

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  • You have an outdoor majlis that needs seasonal cooling

    We check how open the majlis is and assess its structure, then design the duct route and exhaust openings so cool air reaches the seating area without humid air building up inside.

    Ask on WhatsApp

What the work covers

  • Weatherproof roof collar fitted
  • G90 galvanised duct runs
  • Branch and air outlet connections
  • Exhaust openings for air changes
  • Airflow check after start-up
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How we work

How we work

  1. 1

    Site survey first

    We visit, measure the space and check how open it is, because evaporative cooling needs enough ventilation; without it humidity rises inside and the cooling effect drops.

  2. 2

    Plan the duct route

    We plan the main duct run, branches, air outlet positions and exhaust opening locations, and show you the layout before any work starts.

  3. 3

    Install duct and seal roof

    We open the roof, fit and seal the collar against leaks, then run the galvanised duct and hang it on proper supports so it does not sag.

  4. 4

    Start-up and test

    We run the evaporative cooler and check that air reaches every outlet and that the exhaust openings are working so fresh air is visibly moving through the space.

Planned duct or a quick run?

AlrabihThe usual way
Roof sealWeatherproof, sealed collarSilicone that cracks in heat
SheetG90 galvanisedUnspecified gauge
ExhaustSized openings for air changesLeft to chance
Space suitabilityConfirmed by surveyNot checked
Duct supportsFixed hangers along the full runDuct left unsupported

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 Mahamid is densely built with closely spaced residential and commercial blocks and limited roof space, requiring careful planning of cooler and duct placement. Tight roof space means the cooler and duct must be fitted efficiently without waste, and distribution across multiple floors needs strong air pressure and wise duct splitting. The dry eastern heat provides good evaporative cooling conditions, but dense building and close proximity may raise ambient temperature.

Al Mahamid lies in east Jeddah, a densely built area of closely spaced residential and commercial blocks.

Most Al Mahamid buildings are multi-storey blocks with limited roofs, making duct planning and air distribution more complex than single villas.

The AC setup in Al Mahamid

  1. 1

    Single cooler with duct split for multiple floors

    One unit on the tight roof distributes cool air via split duct with dampers controlling flow to each floor.

  2. 2

    Exhaust openings distributed in tight gaps

    Exhaust openings are placed in available gaps between close buildings for safe, effective discharge.

  3. 3

    Robust sealant against dust and heat

    The roof opening is sealed robustly against dust and the intense heat from dense building.

Before the visit

Before our visit in Al Mahamid

  1. 1

    Confirm access to shared or building roof

    If the roof is shared, coordinate with building management to ease team access and obtain clearances.

  2. 2

    Measure available roof space

    A simple sketch of roof dimensions and gaps helps the team pinpoint the cooler location precisely.

  3. 3

    Coordinate with building management and residents

    Inform management and residents of the fitting and testing schedule to avoid disruption.

More districts for Evaporative (desert) duct installation

Other services in Al Mahamid

FAQ

Questions about Evaporative (desert) duct installation

Does evaporative cooling work in Jeddah in summer?

Evaporative cooling relies on water evaporation and weakens when humidity is high. In Jeddah, humidity is higher near the coast and lower inland. The survey decides whether the space and the season are suitable, which is why we do not start before visiting the site.

Why do exhaust openings matter as much as the duct runs?

An evaporative cooler pushes fresh air in continuously. Without an exit path, humid air builds up inside and the felt temperature rises. Properly sized exhaust openings keep air moving through, not piling up, and that is the core of how this type of cooling works.

What sheet do you use for the duct?

We use G90 galvanised steel sheet, which resists rust in Jeddah's humid and salty air. The duct sections are formed in our workshop before being taken to site, then hung on supports along the run to stop them sagging.

Can one cooler supply duct to more than one area?

Duct can be branched from one unit to more than one outlet, but each branch reduces the airflow at every opening. The survey decides whether the cooler has enough output for the total area, or whether a separate unit for each wing is the better answer.

Can evaporative cooler duct run through a false ceiling?

Evaporative cooling depends on continuous air movement and exchange, which requires exhaust openings in the same space the duct serves. A false ceiling restricts that flow unless dedicated openings lead air out of the building. The site survey decides whether the structure allows it, because the duct run and the exhaust are designed together as one system, not separately.

Al Mahamid's roofs are tight, is there enough space for the cooler?

Roofs are limited but usually accommodate one unit. Our team's survey assesses available space and determines feasibility.

How do you distribute air evenly across multiple floors?

The team splits the duct wisely and uses air dampers to ensure even distribution on each floor.

Does Al Mahamid's dense building affect evaporative cooling efficiency?

Dense building may raise ambient heat, but dry eastern air provides good conditions. The team measures heat and humidity during the survey.

With closely spaced buildings, where do you place exhaust openings?

We site openings based on available gaps between buildings and safe directions for warm air discharge.

The Jeddah corniche in cool weather

Start with a site survey

WhatsApp a photo and rough dimensions of the space, and we will book a survey visit in your district, Saturday to Thursday, eight in the morning to eight in the evening.

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