Tunnel vs Cross Ventilation — Which Fits Your Poultry House?
Tunnel ventilation moves air lengthways through the house at 2.5–3.5 m/s to create wind-chill; cross ventilation exchanges air across the width at much lower velocity. Both work — the right choice depends on climate, house geometry and stocking density.
Tunnel ventilation
- Excellent bird cooling in hot climates (wind-chill effect)
- Enables higher stocking densities at the same thermal load
- Works well with evaporative pad cooling
- Predictable performance in long, narrow houses (L:W ≥ 4:1)
- Higher capital cost (fans, inlets, pads)
- Power failure = heat stress within minutes — generator is mandatory
- Requires trained operators for age-transition management
- — Broilers ≥ 40,000 birds/house in hot regions
- — Long, narrow house geometry (L:W ≥ 4:1)
- — Design outside temperature ≥ 32 °C
Cross ventilation
- Lower CAPEX — fewer fans, no tunnel doors, no pads
- Lower peak electrical draw
- More forgiving during power interruptions
- Simpler controls and maintenance
- Cooling capacity limited without fogging
- Not suitable for hot-humid climates at high density
- Air-speed uniformity harder in wide houses
- — Layers and breeders in mild climates
- — Short or wide house geometry
- — Small-to-medium flocks (< 20,000 birds/house)
| Criterion | Tunnel ventilation | Cross ventilation |
|---|---|---|
| CAPEX | Higher (fans + inlets + evap pads + tunnel doors) | Lower (fewer fans, no pads) |
| OPEX (per bird/cycle) | Higher energy, similar labour | Lower energy, similar labour |
| Peak electrical draw | High — all tunnel fans running | Lower — staged assist fans |
| Maintenance intensity | Fan belts, pad water quality, actuators | Fewer moving parts, simpler service |
Choose tunnel when design outside temperature exceeds 30 °C or stocking density is high; choose cross when the climate is mild, houses are short, or generator/power reliability is limited. Hybrid tunnel-with-cross-mode is common for temperate climates with hot summer weeks.
Frequently asked questions
Sometimes — but tunnel requires an aspect ratio ≥ 4:1 and a tunnel-door endwall. Wider houses rarely retrofit economically.
The generator must carry every fan required to hold thermal balance at design outside temperature, plus feed/water and lighting. Undersized generators are the most common heat-loss cause.
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