Ventilation Diffuser Count Calculator

Estimate Required Air Diffusers

Input Fields

Air flow

Q

m³/h

Air speed

v

m/s

Diffuser diameter

d

m

CalculateReset

Your Results

Diffusers

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Diffuser Count Calculation Formula

$$\text{Diffuser Count} = \frac{Q}{v \cdot A \cdot 3600}, \quad A = \pi \cdot \left(\frac{d}{2}\right)^2$$

Where:

• $$Q$$ = airflow in m³/h
• $$v$$ = air velocity in m/s
• $$d$$ = diffuser diameter in meters
• $$A$$ = cross-sectional area of diffuser in m²
• $$3600$$ = seconds in one hour (to convert velocity to hourly volume)

This formula is used in ventilation and HVAC design to determine how many diffusers are needed based on desired airflow, diffuser size, and acceptable air speed. For instance, larger diffusers or lower velocities reduce the number needed. The result aids in balancing performance and noise in system design. This calculator ensures precise diffuser selection for energy-efficient air distribution.