CalcGrille and Diffuser Calculator
Last updated: 2026-08-24
Grille and Diffuser Calculator — Air distribution grille and diffuser sizing.
Inputs
Result
Enter values and press Calculate
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How to use it
- Convert flow rate: 200 m³/h ÷ 3600 = 0.0556 m³/s
- Calculate cross-section libre: 0.0556 ÷ 2.0 = 0.0278 m²
- Determine lado square: √(0.0278) × 100 = 16.7 cm
- Normalizar a measurements comerciales: 20×20 cm
- Estimate alcance of the chorro: √(0.0278) × 10 = 1.7 m
Common mistakes
- ⚠️ Speed of cara excesiva in impulsión — >2.5 m/s generates ruido and corrient is molestas
- ⚠️ Confusing area libre with area total — the area libre is ~70-80% of the area frontal
- ⚠️ Not considering the alcance of the chorro — in techos altos need difusor is ajustables
Worked example
Calculate grill is and diffusers needed for 0.8 m3/s airflow.
Sección libre: {area_libre_m2} m². Rejilla normalizada: {tamano_rejilla_cm} cm. Alcance of the chorro: {alcance_m} m.
Input guide
| Field | Typical range |
|---|---|
| caudal_m3h | Airflow per grille. Residential: 50-200 m³/h, Commercial: 200-1000 m³/h |
| velocidad_cara_ms | Supply: 1-2.5 m/s, Return: 2-3 m/s. >2.5 m/s caus is perceptible noise |