Poultry house too hot — how to evaluate ventilation and cooling before you buy equipment.
Use house cross-section and a professionally selected air-speed assumption to estimate tunnel airflow, then check actual fan curves at design pressure, inlets, leakage and climate. Tunnel airflow is not minimum ventilation, a heat-balance design or a universal safe air speed for every species and age.
- Air velocity & tunnel capacity
- Evaporative cooling
- Insulation & static pressure
- Controllers & sensors
Budgeting the upgrade? poultry equipment cost guide
How do I size ventilation before buying more fans?
Use house cross-section and a professionally selected air-speed assumption to estimate tunnel airflow, then check actual fan curves at design pressure, inlets, leakage and climate. Tunnel airflow is not minimum ventilation, a heat-balance design or a universal safe air speed for every species and age.
Symptoms and records
Hot-day performance changes, controller alarms and uneven bird-level readings call for a measured climate review; abnormal animal signs need veterinary attention.
Diagnostic decision tree — evidence, not diagnosis
- 1. Fan rating is free-air only
→ Request certified airflow and power at your design static pressure.
- 2. Airflow varies along the house
→ Inspect leakage and distribution before adding fan capacity.
- 3. Airflow is adequate but heat remains
→ Review humidity, cooling, envelope and control with an engineer.
Worked example — labeled assumptions
Illustrative geometry, not a recommended speed: 14 m × 2.6 m × 2.5 m/s = 91 m³/s, or 327,600 m³/h. A rectangular section ignores roof geometry and obstructions. Fan quantity depends on tested airflow at working pressure, not fan diameter alone.
HatchMatch illustrative arithmetic, 17 October 2026. Not observed farm results, a quotation, a recommended target or professional certification.
More fans, cooling pads or a controller: which evidence distinguishes them?
Compare airflow delivery, distribution and cooling conditions separately. Log temperature, humidity, bird-level air movement and static pressure under the same operating stage; a high temperature alone cannot select the purchase.
| Option | Evidence to request | What it cannot establish |
|---|---|---|
| Fan or inlet review | Measured working-pressure airflow, fan curves, leakage and air-speed map. | Nameplate/free-air capacity is not delivered airflow; geometry alone is not a heat balance. |
| Pad or cooling review | Outdoor dry/wet-bulb conditions, pad wetting and measured incoming-air conditions. | Evaporative cooling is constrained by humidity; more water is not automatically better. |
| Controller or sensing review | Calibrated sensors, stage logs and the engineer's intended control sequence. | New controls cannot supply missing physical airflow or remove a structural constraint. |
What belongs in a comparable quotation?
Include species, age, geometry, outdoor dry/wet-bulb conditions, design static pressure, measured air speed, fan curves, inlet area and backup-power acceptance tests.
When expert help is needed
A ventilation engineer selects the design conditions; qualified staff assess bird welfare and heat-related signs.
Start with measured air velocity, not fan count
In tunnel-ventilated broiler houses the wind-chill effect on the bird depends on velocity at bird level, not on installed fan horsepower. Measure velocity at several points along the house on a hot afternoon with the tunnel fully engaged. Low or uneven readings usually point to leaking sidewalls, blocked inlets, dirty shutters, worn belts, or a fan bank that no longer delivers rated airflow at the actual static pressure.
Then check the cooling stage
Evaporative pads only deliver their rated temperature drop when pad area matches tunnel airflow, water distribution wets the full pad face, and the pad is clean and not scaled. Undersized pad area, partially blocked distribution headers, recirculation sumps with heavy mineral load and pads past their service life all reduce the achievable drop. In very humid climates the achievable drop is inherently limited, which changes the design toward higher velocity rather than deeper cooling.
House envelope and controller settings
Roof and sidewall insulation, solar gain, curtain and door leakage and static-pressure control determine how much of the installed capacity actually reaches the birds. Controller set points, minimum ventilation curves, transition points between minimum, transitional and tunnel modes and sensor placement should be reviewed before any capital purchase — a mis-set transition point can make a correctly sized system behave like an undersized one.
Only then define the equipment scope
Once you know whether the constraint is airflow, cooling capacity, envelope or control, the equipment scope becomes specific: additional or higher-efficiency tunnel fans, pad system replacement or extension, inlet and static-pressure upgrades, insulation works, or a controller and sensor upgrade. HatchMatch sources these vendor-neutrally and normalises any quotations received from third-party manufacturers so they can be compared line by line.
Important limitation
HatchMatch is an equipment sourcing and project platform, not a veterinary or production-consultancy service. Equipment alone does not guarantee biological or production results — the guidance below describes factors that commonly warrant evaluation, and any capital decision should be confirmed with your own technical advisors.
Define the cooling scope — we'll pre-fill the RFQ.
Choose the scope closest to what your review indicates. We pass it into the RFQ builder with the right equipment category and notes.
Commercial operators only. Projects from approximately USD $250K+ are prioritised for full sourcing and human review; smaller requests may be redirected to our self-serve supplier directory.
How your sourcing request is handled
- You describe the needRequest type, species, capacity, scope, destination and timing. Unknown answers are fine; say what still needs confirming.
- Our team sources and evaluates fitA person reviews the brief, researches independent suppliers for your scope and checks their fit against your stated requirements. Suppliers decide whether to respond.
- We compare options for youAny responses received are organised on the same fields so scope, assumptions and exclusions can be compared. Supplier communication runs through HatchMatch; contact details are not shared automatically.
Free for buyers · B2B requests reviewed from USD 250,000
Every brief is reviewed by a person; we aim to reply within 2 business days. Supplier response times vary. HatchMatch does not confirm supplier certification, animal-health or regulatory status, stock or delivery dates; those come from suppliers' own documents and the relevant authorities.
Buyer guides: how to write a project RFQ · how to evaluate supplier offers