Desert cooler, proper duct
Evaporative (desert) duct installation in Harat Al Mazloum
In Harat Al Mazloum, central Jeddah, evaporative cooling suits residential buildings and warehouses with exposed roofs and open floor areas. The system mounts on the roof and distributes cool air through metal duct runs with exhaust openings, and our site survey confirms whether the system will work for your space.
- 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.
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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.
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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
Harat Al Mazloum holds a mix of older residential buildings, warehouses and small shops, many with flat roofs and relatively large interior floor areas. The dry air in the hot climate makes evaporative cooling an economical choice here, but roofs need careful inspection to confirm they are sound and can carry the weight of the unit and metal duct runs, and water drainage must be coordinated around the new openings.
Harat Al Mazloum sits in Jeddah's historic downtown, a district of older residential and commercial buildings alongside warehouses with flat roofs.
Most buildings here have flat roofs, which allows the evaporative unit to mount directly without the need for complex structural additions.
The AC setup in Harat Al Mazloum
- 1
Evaporative unit mounted on the flat roof
The flat roof here is ideal for mounting the unit directly without needing a separate platform.
- 2
Galvanised metal duct for large floor areas
Metal duct runs from the roof distribute cool air across large areas efficiently, especially in warehouses and spacious shops.
- 3
Exhaust openings in the exterior walls
Exhaust openings are cut into exterior walls or windows to direct warm air straight outside.
Before the visit
Before our visit in Harat Al Mazloum
- 1
Inspect the roof's structural soundness
Confirm the roof and outer layer are in good condition before the survey date, and let us know of any existing leaks or structural concerns.
- 2
Identify the areas to be cooled
Prepare a list of the areas to cool (warehouse, shop, hall) with approximate dimensions so we can size the duct and capacity needed.
- 3
Point out possible locations for exhaust openings
Point out exterior walls or windows where we can open exhaust outlets without affecting the building's structural integrity or interior finishes.
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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.
Is evaporative cooling suitable for the large warehouses in Harat Al Mazloum?
Yes, if the warehouse is well ventilated, has a flat roof in good condition, and is sufficiently spacious. We inspect the roof and interior layout first to ensure the system will distribute air evenly.
The old roof may leak already; will the new installation cause more water seepage?
We cut the roof carefully and seal the new openings with waterproofing materials to prevent water ingress. Pre-installation roof inspection confirms the structure is sound enough to carry the unit and duct.
The large metal duct takes up interior space; how do we size it?
Duct size depends on the floor area to be cooled and airflow speed. During the survey, we measure the space and calculate the diameter needed to deliver cool air efficiently without wasting interior space.
The exhaust openings release warm air; where exactly does it go?
We position the exhaust openings on exterior walls or windows to direct warm air straight outside the building. The opening locations are decided during the survey based on the building layout and prevailing winds.
