Why m/s and not cfm/bird?

Tunnel design targets air speed over birds, not bulk cfm/bird. 2.5-3.0 m/s is standard for hot-climate broilers at end-of-flock; layer aviaries plan lower.

Yes — inlet area and static pressure drive real cfm. Add ~15% to nameplate fan capacity for design safety.

Ventilation

Tunnel ventilation — cfm sizing.

Compute peak tunnel-ventilation cfm from house cross-section and target air speed, plus indicative fan count for typical 48-inch 25,000 cfm fans.

Inputs

House width (m)Sidewall height (m)Target air speed (m/s)2.0 m/s temperate; 2.5-3.0 hot climates.

Results

Cross-section: 36.4 m²
Airflow: 91.0 m³/s
Peak cfm required: 192818 cfm
48-inch fans (25k cfm): 8

Get supplier quotes All calculators

FAQ

Common questions

Why m/s and not cfm/bird?: Tunnel design targets air speed over birds, not bulk cfm/bird. 2.5-3.0 m/s is standard for hot-climate broilers at end-of-flock; layer aviaries plan lower.
Do inlets matter?: Yes — inlet area and static pressure drive real cfm. Add ~15% to nameplate fan capacity for design safety.