Balanced air distribution
AC duct installation in Radwa
In Radwa, north-east Jeddah, duct installation in modern villas and residential blocks calls for precise balancing of chilled air across medium distances. Alrabih designs ductwork to branch length and unit capacity, with complete insulation to shield cold from coastal humidity.
- Sized branches
- Sealed insulation
- Clean return path
Clients We're Proud to Serve
Organisations and companies that trusted Alrabih with their projects.
When you need a properly designed duct fit
- 1
One room cold, another warm
The unit runs but one room is too warm while the next is too cold. The cause is usually unbalanced branches or a diffuser that was never adjusted, not a fault in the unit itself.
- 2
Moisture and sweating on the ceiling
In Jeddah's humid air, uninsulated cold duct sweats on the outside and water collects on the plasterwork. Proper insulation with Armaflex or Kimmco stops the problem before it damages the ceiling finish.
- 3
Installing a concealed unit in a new build
The right time to fit duct properly is during the fit-out, before the false ceiling closes. We agree plenum dimensions, branch sizes and the return-air route at the survey before any work starts.
Who it's for
Fitting a concealed unit in your new villa
Before the false ceilings close, we design the plenums, branches and return-air route to suit the unit and each room in the villa.
Ask on WhatsAppSweating ceiling and uneven airflow in your building
We inspect the existing branches and return-air path, re-insulate the cold duct, and set the dampers so temperature evens out across every section of the building.
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What the duct installation covers
- Supply and return plenums
- Sized branch to each room
- Armaflex or Kimmco insulation
- Diffuser balancing with dampers
- Airflow check before ceiling closes
How we work
How we work
- 1
Site and unit survey
We measure the rooms and study the unit's data and plenum spec, and we settle the return-air route before deciding on branch sizes.
- 2
Design branches and plenum
We size each branch so it takes the right share of air without starving rooms farther from the unit, and we plan a return path with a correctly sized intake opening.
- 3
Fit and insulate
We fix the plenums and branches using SMACNA-standard duct, then insulate every cold surface with a sealed layer that stops sweating in Jeddah's high humidity.
- 4
Balance and hand over
We set each diffuser damper and check airflow in every room with you before the false ceiling is closed, then leave the site clean.
Designed duct or just connected duct?
| Alrabih | The usual way | |
|---|---|---|
| Branch sizing | Calculated per room | Connected without sizing |
| Return air | Routed with a sized intake | Left to chance |
| Duct insulation | Sealed against sweating | Thin or absent |
| Diffuser balance | Damper set per room | All diffusers fully open |
| Pre-closure airflow check | Done with you before closing | Faults found after ceiling closes |
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
Radwa is a medium-density residential district of standard villas and multi-storey apartment blocks, most with reasonable roof void space for duct runs. The east-facing location exposes buildings to intense heat and humidity alike, making duct insulation and airflow balancing critical to avoid cooling loss over long routes. Installation coordination with villa owners or building management is essential because many suspended ceilings are recent and may need reinforcement.
Radwa lies in north-east Jeddah, a medium-density residential zone of modern villas and apartment blocks facing the hot east exposure.
Most central units in Radwa sit in suspended ceilings or attics and distribute air through standard-length duct to three or four rooms per villa or flat.
The AC setup in Radwa
- 1
Central unit in ceiling void or attic
Villas and flats in Radwa mount the concealed unit in false ceilings or attics to feed medium-length duct branches.
- 2
Insulated duct with balanced branches
Each branch is fully insulated and fitted with a pressure damper to balance cold airflow between different rooms.
- 3
Air vents installed in each room or zone
Each room receives a low-profile vent with an adjustable damper to control the amount of cold air delivered.
Before the visit
Before our visit in Radwa
- 1
Send villa or flat plan with room dimensions
Send a plan photo and basic dimensions so we can calculate duct sizes, plan routes, and prepare before the visit.
- 2
Confirm access to ceiling void or attic
If the ceiling is recently installed, ensure safe access openings to the void space are available before the installation date.
- 3
Confirm planned outdoor unit location
Show where the outdoor unit will go so we can plan copper pipe routes from inside and coordinate ductwork precisely.
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FAQ
Questions about AC duct installation
Why does duct in Jeddah sweat more than elsewhere?
Jeddah's outdoor air carries high moisture because of its coastal location. When that air touches a cold duct surface, the moisture condenses immediately. Insulating with a thick enough layer of Armaflex or Kimmco, with all joints sealed, raises the outer surface temperature above the dew point and stops the sweating.
Does a longer branch deliver less air to the room?
Yes, a longer branch resists airflow more than a short one. This is why we size each branch individually, so near and far rooms receive balanced quantities of air, and we complete the adjustment with dampers during start-up.
How do you size the return-air opening?
The intake opening must be large enough so the unit does not work against negative pressure that strains it. We check the unit data and plenum requirements and decide size and position at the survey, because placing it behind a closed door or away from occupied areas changes the calculation.
Does a large room need more than one air outlet?
Usually, yes. A long majlis or a wide living room cannot be served by one outlet, because the air cools one end and leaves the other. We spread the outlets along the room, split the branch between them, and keep them away from the return grille so cool air does not go straight back to the unit.
Does the duct material affect sweating and airflow balance?
Yes. Sheet metal duct holds its shape under air pressure, so flow quantities stay as designed. Flexible duct can compress or sag, changing its cross-section and upsetting the balance. We therefore fabricate the main branches from galvanised sheet in our workshop and use flexible duct only for the shortest possible connection at each diffuser.
My villa is standard size, how many duct branches do I need?
Standard villas in Radwa typically need three or four duct branches from the main unit, one per living zone or group of rooms.
My flat's suspended ceiling is new, can it support the duct and insulation weight?
We inspect the ceiling before fitting and secure duct with strong brackets from the main structure, not from the false ceiling, to avoid excess load.
The east-facing heat in Radwa is intense, does duct lose cooling power?
Yes, the eastern heat increases cooling loss over duct, so we fully insulate all branches thickly and balance pressure to ensure chilled air reaches distant rooms intact.
How do I check for air leaks in duct branches after installation?
We run an air-leak test on all branches before final closure, seal any gaps with air-sealant, and give you a test report when done.
