Desert cooler, proper duct
Evaporative (desert) duct installation in Al Hafnah
In Al Hafnah, east Jeddah, evaporative duct cooling suits modern apartment blocks and villas with spacious roofs. Alrabih carefully opens and seals the roof against water and dust, then runs calibrated ducts that distribute cool air across units.
- 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.
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 Hafnah is a relatively modern district with medium-rise apartment blocks and spaced villas, featuring practical roofs and orderly urban planning. The area experiences high heat and moderate to low dryness, making evaporative cooling suitable for families and residential blocks. Exposed roofs and spaced buildings provide good access and straightforward horizontal and vertical duct runs without major complication.
Al Hafnah lies in the east and features modern apartment blocks and well-spaced villas with wide, regular roofs.
Most Al Hafnah roofs are safe and spacious, and the distance from roof to interior rooms is manageable for standard duct runs.
The AC setup in Al Hafnah
- 1
Central rooftop cooler serving multiple storeys
The cooler distributes chilled air through a main vertical trunk branching into horizontal runs per storey and per unit.
- 2
Thermally insulated ductwork in graduated sizes
Ducts graduate from large main trunk to smaller branches, each fully insulated to protect cool air.
- 3
Supply outlets in different rooms
Each flat has outlets in main rooms, with partial closure options for better distribution.
Before the visit
Before our visit in Al Hafnah
- 1
Verify roof integrity and structural capacity
Confirm the roof is leak-free and structurally sound to bear the cooler and equipment weight before the visit.
- 2
Tell us floor count, unit count and cooling priorities
Provide details of floor count, unit arrangement and which areas are priority for cooling.
- 3
Ensure structural voids and stairways are available
Check that inter-storey voids and internal stairs are accessible and safe for vertical ductwork passage.
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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 right for a modern residential block in Al Hafnah?
Yes, modern residential blocks in Al Hafnah are very well suited to evaporative cooling. Moderate dryness and high heat support efficiency, and a site survey confirms perfect compatibility with the building.
How do you integrate the evaporative cooler with the building's modern design?
We choose a roof location screened from front facades and use architectural cover panels where needed. A site survey identifies the best solution that preserves building aesthetics.
Al Hafnah can be less dry, does that affect cooler efficiency?
Slightly higher humidity somewhat reduces evaporative efficiency, but most of the year in Al Hafnah maintains adequate dryness. A site survey measures humidity and heat to confirm economic performance.
What is the best way to distribute ductwork on a 6 or 8-storey block?
We use main vertical ducts from the roof branching into horizontal runs on each storey. A site survey determines the optimal path and required diameters to ensure equal and efficient distribution.
