Poultry House Ventilation Design for Saudi Arabia’s Hot Climate

By Henan Daofeng Poultry Equipment Content Team | Updated 17 July 2026

Saudi Arabia is already a major table-egg producer. Official information published in 2026 reported more than 8.4 billion table eggs produced in 2024, with table-egg self-sufficiency at 103%.For equipment buyers, this means the opportunity is not based on a simple shortage story. The more relevant questions are how farms can expand reliably, control production quality and protect birds and equipment under demanding climatic conditions.

Ventilation is central to that discussion. A layer house in Riyadh does not face exactly the same cooling challenge as a house near Jeddah or Dammam. Saudi Arabia’s National Center for Meteorology describes a generally hot climate, with higher humidity near the coasts.[3] A design that performs well in inland dry heat may need a different control strategy in a humid coastal location.

Design principle

A Saudi poultry-house ventilation system should be calculated from the exact location, design weather, house geometry, bird load and equipment resistance. The country name alone is not a design specification.

1. Begin with the Local Climate, Not a Generic ‘Middle East’ Setting

Saudi projects should distinguish at least three broad conditions:

Hot, dry inland conditions: high daytime temperature, low humidity during many periods and strong potential for evaporative cooling when water and pad condition are suitable.
Hot, humid coastal conditions: lower evaporative-cooling potential during humid periods, making airflow, air exchange and control timing especially important.
Large day-night or seasonal changes: systems must transition between minimum ventilation, intermediate ventilation and full hot-weather operation without creating unstable conditions.

The design file should use reliable local weather data and define summer dry-bulb temperature, relative humidity or wet-bulb temperature, prevailing dust conditions and winter minimums. One national average cannot represent every project location.

2. Understand What Ventilation Must Accomplish

Ventilation is not only a temperature-control system. It must also remove bird heat and moisture, dilute gases and dust, provide oxygen and distribute air to all occupied zones. FAO guidance identifies temperature, humidity and air movement as essential parts of the poultry environment.[4]

In a multi-tier layer house, the design challenge is three-dimensional. Air must move along the building, across rows and through different cage levels. A high total fan capacity does not guarantee that birds in the center or upper tiers receive the same cooling effect as birds close to a clear air path.

3.Build the Hot-Weather System as a Complete Air Path

A tunnel-ventilation system typically draws air through designated inlets or evaporative cooling pads and exhausts it with fans at the opposite end. The house, pads, openings, cage rows and fans form one air path. Each part affects the others.

The design should coordinate:

House tightness, so hot outside air does not bypass the intended inlets or pads.
Inlet and pad area, so resistance and air velocity remain within the selected equipment’s operating range.
Fan performance at the expected static pressure, not only free-air catalog capacity.
Cage and aisle arrangement, which can obstruct or redirect airflow.
Sensor placement at representative bird zones instead of only near a wall or controller.
Control stages that bring fans, inlets and cooling online in a stable sequence.

University extension guidance warns that static pressure is often underestimated in tunnel houses, which can lead to lower-than-expected airflow.[5] Cooling pads, light traps, dirty shutters and building leakage all influence actual fan performance. For this reason, the selected fan should be evaluated on its performance curve at the calculated operating pressure.

4.Use Air Speed and Air Exchange for Different Jobs

Air exchange removes heat and moisture from the house. Air speed over the birds supports convective cooling and can improve the birds’ effective thermal comfort during hot weather. These functions are related but not identical.

A design team should calculate the required airflow and then model or verify how that air is distributed at bird level. Long houses, multiple cage tiers, cross-conveyors and structural columns can create low-velocity areas. Commissioning measurements are therefore as important as the design calculation.

It is not responsible to state one universal target air speed for every layer project without considering bird age, housing system, temperature, humidity and the management guide used by the farm. The project’s veterinarian, production team and ventilation engineer should agree on operating targets.

5.Match Evaporative Cooling to Dry-Bulb and Wet-Bulb Conditions

Evaporative cooling works by adding moisture to air as water evaporates, reducing dry-bulb temperature. Its potential depends on the difference between dry-bulb and wet-bulb temperature. UGA poultry-ventilation guidance notes that drier weather and lower wet-bulb temperature provide greater cooling potential.[6]

This matters across Saudi Arabia:

In dry inland heat, well-maintained pads may provide substantial temperature reduction, but they also increase humidity and static pressure.
In humid coastal conditions, the achievable temperature drop may be smaller. Excessive pad operation can add moisture without delivering the expected benefit.
At night or during transitional weather, full pad operation may be unnecessary even when daytime conditions are severe.

Controls should therefore use suitable temperature and humidity inputs rather than a fixed calendar. Pad operation, fan staging and inlet control should be commissioned for the actual location.

6. Protect Cooling Performance Through Water Management

A cooling pad is also a water system. Saudi projects should consider water availability, storage, pump redundancy, filtration and mineral content from the beginning. Poor water quality can contribute to scale, blocked distribution holes and uneven wetting. Uneven wetting reduces effective pad area and can create hot zones.

The maintenance plan should cover water testing, treatment where required, tank cleaning, pump inspection, distribution-pipe flushing, removal of debris and seasonal pad inspection. University of Kentucky guidance emphasizes that pad selection should consider effectiveness, useful life, maintenance and service—not initial cost alone.[7]

Water-efficiency point

Do not present evaporative cooling as 'free cooling.' It consumes water and adds resistance to airflow. The system should be designed to deliver a useful cooling effect with monitored water use, correct pad wetting and regular maintenance.

7.Design for Dust, Sand and Equipment Exposure

Dust and windblown sand can affect shutters, pads, sensors, motors, bearings and electrical enclosures. The project should evaluate local exposure and specify suitable protection, access and cleaning intervals.

Practical measures may include protected air-intake structures, appropriate screens that do not create excessive resistance, sealed or suitably rated electrical enclosures, accessible fan shutters, sensor shields and a cleaning plan. Any screen or filter added to the air path must be included in the static-pressure calculation and maintained; a neglected restriction can be more dangerous than the dust it was intended to stop.

8.Check Air Distribution Across Every Cage Tier

Multi-tier equipment increases bird capacity per unit of floor area, but it also makes air distribution more demanding. The design review should examine the upper, middle and lower tiers, the center of the house, cage ends and areas around egg or manure cross-conveyors.

During commissioning, measure temperature, humidity and air velocity at multiple locations under representative fan stages. Smoke tests or other suitable visualization methods can help identify short-circuiting and dead zones. If the measurements do not match the design intent, inlet opening, sealing, fan staging or obstructions may need adjustment before birds are placed.

9.Use Controls That Operators Can Understand

A modern controller can stage fans, move inlets, operate pumps and issue alarms. However, a sophisticated interface is not a substitute for a clear operating philosophy.

The operator should be able to answer:

Which fans run at each stage, and what triggers the next stage?
When do cooling pads start and stop?
What happens if a temperature, humidity or pressure sensor fails?
Which alarm reaches which person, and how quickly must they respond?
Can critical equipment be operated manually and safely?
How are settings, alarm events and maintenance changes recorded?

Remote monitoring is valuable when it supports trained people. It should not create the impression that a farm can be left without local inspection.

10.Treat Backup Power as Part of Ventilation Design

In a closed, high-density house, loss of ventilation during extreme heat can become an emergency quickly. Backup generation, automatic transfer, fuel availability, alarm communication and manual response procedures should be designed before flock placement.

The electrical engineer should identify critical loads and starting currents, not size a generator from running power alone. The farm should test transfer and restart sequences under realistic conditions. Staff need a written plan for generator failure, controller failure, pump failure and communication loss.

Emergency openings or other fail-safe measures, where applicable, should be designed as part of the building and local safety plan. They are not a substitute for adequate backup power and maintenance.

11.Commission the House Under Measured Conditions

Before birds arrive, test the system through its operating stages. Confirm fan rotation, shutter opening, belt tension, inlet travel, pad wetting, pump flow, sensor agreement, alarm delivery and generator transfer.

Record static pressure and air velocity at agreed measurement points. Recheck the house after initial operation because dust, belt alignment, pad condition and management changes can alter performance. A clean commissioning report gives the owner, installer and supplier a shared baseline for future maintenance.

Common Mistakes to Avoid

Copying a fan count from another farm without checking house resistance and climate.
Treating all Saudi locations as equally dry.
Sizing fans by free-air capacity instead of performance at operating static pressure.
Adding restrictive screens, pads or light traps without recalculating airflow.
Using one temperature sensor to represent a long multi-tier house.
Ignoring water quality until pads begin to scale or wet unevenly.
Installing automation without a tested backup-power and alarm-response plan.
Commissioning the ventilation system only after birds have been placed.

Frequently Asked Questions

Is tunnel ventilation suitable for layer farms in Saudi Arabia?

It can be suitable for closed commercial houses when the air path, fan performance, inlets or pads, cage layout and controls are engineered as one system. Suitability still depends on the location, house and production system.

Are cooling pads always effective in Saudi Arabia?

Their cooling potential is generally greater in dry conditions and smaller when outside air is humid. Local dry-bulb and wet-bulb conditions, water quality, pad area, cleanliness and airflow determine actual performance.

How many exhaust fans does a 50,000-layer house need?

Bird number alone is not enough to answer. The calculation requires house dimensions, bird and equipment heat load, local design weather, target air exchange or speed, inlet and pad resistance, leakage and the selected fan's performance curve.

What should be monitored remotely?

Common priorities include temperature at several zones, humidity, static pressure, equipment status, power status and high-temperature alarms. The monitoring plan should match the farm's response capability and should not replace local inspection.

Planning a Saudi Layer Project

For an initial ventilation proposal, provide the project city, house dimensions, bird capacity, cage layout, insulation, design weather data, electricity, water test, desired automation and backup-power plan. A responsible supplier should identify missing inputs, explain assumptions and coordinate cage and climate-control design before finalizing equipment.