Desert cooler, proper duct
Evaporative (desert) duct installation in Al Hijrah
In Al Hijrah, north Jeddah, evaporative duct installation suits the spacious residential buildings with exposed roofs. We carefully open and seal the roof against rain and dust, then run galvanised ductwork to the spaces needing cooling.
- 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
Al Hijrah comprises relatively modern, open-plan residential buildings with accessible roofs and spacious outdoor areas, making evaporative ductwork a practical choice for larger zones and hallways. The flat roofs here are easy to reach, and the open layouts offer safe paths for running ducts without major architectural obstacles. The site survey determines whether evaporative cooling suits the seasonal air humidity and drainage needs.
Al Hijrah lies in north-east Jeddah, a district of modern residential blocks with flat roofs and open architectural design.
Most residential buildings here feature flat, work-safe roofs, and the evaporative duct drainage needs routing to gutters or external ground areas.
The AC setup in Al Hijrah
- 1
Roof-mounted evaporative unit with galvanised duct
The cooler is mounted on the flat roof, and galvanised ducts extend to the large indoor zones throughout the building.
- 2
Fixed outlets for water and air discharge
The ductwork terminates with air outlets in the selected zones, and evaporative water is directed to the external gutters.
- 3
Robust sealing against water and dust around the opening
The roof opening is sealed with high-grade weatherproofing to prevent rain and dust ingress into the building.
Before the visit
Before our visit in Al Hijrah
- 1
Clear the roof and identify the preferred cooler location
Ensure the roof is clear of obstacles and tanks, and identify the best spot for mounting the cooler near the main zones to cool.
- 2
Confirm water drainage is available and safe
Verify that gutters or drainage channels exist nearby and are safe for the evaporative water runoff, and tell us their location before we visit.
- 3
Arrange safe roof access for the team
Check that stairs or roof access are safe and clear, and notify the residential compound about the installation date in advance.
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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 ductwork right for our modern residential building?
It depends on the cooler's roof placement, the zones to cool, and seasonal humidity. We visit to assess whether evaporative ductwork is effective for your building.
Al Hijrah's roofs are safe to work on, but how do you install and secure the unit?
We carefully open the roof to a suitable size, bolt the cooler frame securely, and finish with tight sealing against water and dust.
Al Hijrah's humidity varies seasonally, does evaporative cooling work year-round?
Evaporative cooling is most efficient in dry, hot months, but our survey report shows peak performance periods and any seasonal alternatives if needed.
Where does the evaporative duct drainage go in a residential block?
We route the water to the roof gutters or external drainage channels, respecting the building's existing drainage lines.
