Desert cooler, proper duct
Evaporative (desert) duct installation in Al Sahl
In Al Sahl, south Jeddah, evaporative duct installation suits farms, large agricultural greenhouses and storage facilities that need low-power cooling. We carefully open and seal the roof against rain and dust, run galvanised duct across the space, and the survey confirms whether evaporative cooling fits your location.
- Sealed roof
- Galvanised duct
- Air changes
Clients We're Proud to Serve
Organisations and companies that trusted Alrabih with their projects.
When you need evaporative cooler duct
- 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
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
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.
Ask on WhatsAppYou 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
How we work
How we work
- 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
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
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
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?
| Alrabih | The usual way | |
|---|---|---|
| Roof seal | Weatherproof, sealed collar | Silicone that cracks in heat |
| Sheet | G90 galvanised | Unspecified gauge |
| Exhaust | Sized openings for air changes | Left to chance |
| Space suitability | Confirmed by survey | Not checked |
| Duct supports | Fixed hangers along the full run | Duct left unsupported |
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 Sahl is a mixed agricultural and residential area in south Jeddah, dotted with farms, nurseries and large greenhouses with high ceilings and open spans. Evaporative cooling is ideal for these spaces because open, dry air boosts efficiency, and cooling water can often be diverted to irrigation. A site survey is essential to check roof strength (wood or metal), water drainage for overflow, and distance from nearby residential areas.
Al Sahl lies in south Jeddah, an agricultural area with farms and large greenhouses with high, open ceilings.
Large greenhouses and storage facilities here need large-diameter duct (500 mm or larger) with multiple exhaust openings spread across the full area.
The AC setup in Al Sahl
- 1
Extra-large evaporative duct
Very large greenhouses and warehouses need 550, 600 mm or larger duct to cover vast floor areas.
- 2
Regularly spaced exhaust openings
Large agricultural areas need regularly spaced exhaust openings across the entire roof to ensure balanced cooling and ventilation.
- 3
Separate water drainage pipes
We install separate drainage pipes to direct excess cooling water to a well or irrigation system instead of the ground directly.
Before the visit
Before our visit in Al Sahl
- 1
Check roof and full structure condition
Inspect the roof and supporting beams to confirm they can bear the weight of the unit and duct.
- 2
Prepare water overflow drain points
Identify the well or irrigation system where excess cooling water will drain.
- 3
Agree on duct routes and opening locations
With our team, identify the best duct routes on the roof and exhaust opening locations to avoid obstacles and sensitive plants.
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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.
Would evaporative cooling suit my agricultural greenhouse?
Evaporative cooling is ideal for large greenhouses, and slightly humid air may benefit the plants. Our survey checks the roof, drainage and system fit for your crop types.
Can the water used in cooling be recycled for irrigation?
Yes, evaporative cooling water is relatively clean and can be directed to irrigation after simple filtration. The survey shows how to connect the drain system to irrigation pipes.
My greenhouse roof is old wood, is it safe to drill?
We inspect the wooden roof first to confirm its integrity and check for leaks or weakness. If the roof is weak, structural reinforcement may be needed before installation.
Will exhaust openings from my farm bother nearby residences?
We choose exhaust opening locations away from neighbouring homes and direct them toward open space to avoid disturbance.
