Ventilation Grid Count Calculator
This calculator helps you determine the required number of ventilation grids based on the air flow rate, air velocity, and open area of a single grid. It’s useful for HVAC engineers and ventilation system designers to ensure sufficient air distribution in rooms and ducts. Simply input your airflow parameters to get the required grid count.
Calculate Required Number of Ventilation Grids
Ventilation Grid Count Formula
Where:
- $$Q$$ = Air flow rate in m³/h
- $$v$$ = Air velocity in m/s
- $$A$$ = Open area of a single grid in m²
- $$\lceil \cdot \rceil$$ = Ceiling function to round up to the nearest whole number
This formula calculates how many ventilation grids are needed to handle a given air flow without exceeding the desired velocity through each grid.
The number of ventilation grids is a key factor in air distribution system design. This calculation ensures that the total open area provided by the grids can accommodate the airflow at the specified air speed.
For example, if a room requires 7200 m³/h of airflow with a velocity of 2 m/s and each grid has an open area of 0.1 m², the required number of grids is:
\[\left\lceil \frac{7200}{3600 \cdot 2 \cdot 0.1} \right\rceil = \left\lceil 10 \right\rceil = 10 \text{ grids}\]
Proper sizing of ventilation grids helps prevent excessive noise and ensures efficient air delivery.