Desert cooler, proper duct
Evaporative (desert) duct installation in Al Mulaisa
In Al Mulaisa, south Jeddah, evaporative duct installation suits warehouses, workshops and high-ceilinged homes needing energy-efficient cooling. Alrabih's team opens and seals the roof against rain and dust, then runs galvanised duct across the space to distribute cool air efficiently.
- 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 Mulaisa is a spacious district of warehouses, workshops and large residential buildings with high ceilings, where evaporative cooling is an economical choice because it needs no heavy outdoor units. Most roofs here are flat and easy to access, but checking roof strength and rainwater drainage before mounting the evaporative unit is essential. Winds in Al Mulaisa can affect cooling efficiency, so a site survey beforehand confirms whether evaporative cooling suits your space.
Al Mulaisa is in south Jeddah, a district of warehouses, workshops and storage with spacious-roofed residential buildings.
Most warehouses and workshops here have flat roofs and water drainage lines, making rooftop evaporative-unit mounting straightforward.
The AC setup in Al Mulaisa
- 1
Rooftop evaporative unit with galvanised duct run
The flat, spacious roofs in Al Mulaisa's warehouses allow safe unit mounting and straightforward main duct runs across the space.
- 2
Air exhaust openings on lower walls and sides
Cool air from the evaporative unit is distributed through duct, and warm exhaust air leaves through openings in lower walls or sides.
- 3
Separate drainage system distinct from building structure
Condensate water from the evaporative unit drains safely away from the warehouse foundation through dedicated drainage lines.
Before the visit
Before our visit in Al Mulaisa
- 1
Check roof strength and drainage slope
Before the visit, confirm the roof is robust and slopes correctly to drain rainwater away from where the evaporative unit will sit.
- 2
Define the area to cool and air intake and exhaust points
Mark the boundaries of the space you want cooled and clarify where warm air exhaust openings will be positioned based on the warehouse or workshop layout.
- 3
Ensure safe roof access for the team
Let us know if there is safe stairway or rooftop access, and confirm the team can safely carry installation materials without obstacles.
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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.
Does evaporative cooling suit my warehouse in Al Mulaisa?
Yes, evaporative cooling often suits Al Mulaisa's spacious warehouses with high ceilings. However, a site survey confirms its efficiency based on the space size and surrounding humidity levels.
Are the warehouse roofs here strong enough to support an evaporative unit?
Most warehouse roofs in Al Mulaisa are flat and robust, but we inspect the roof on the first visit to confirm it can bear the load and verify the water drainage system.
Do the strong winds here affect evaporative cooling performance?
Yes, Al Mulaisa's winds can reduce the evaporative unit's efficiency, so we measure wind and humidity in the initial survey to confirm evaporative cooling is suitable for your location.
How do you protect the roof from rain and moisture after installation?
We carefully open the roof, mount the evaporative unit, then seal all openings with weatherproof material to prevent water and dust ingress indoors.
