Ventilation Calculator

H.T. & L.T. Room Ventilation

Select Room Type

Acceptable Air Change/Hr

Length (L) M

Width (D) M

Height (H) M

Room Volume ($m^3$)

Room Volume ($ft^3$)

Ventilated Air ($ft^3$/Hr)

Ventilated Air (CFM)

Air Change per Hour

Parking Height (M)

Parking Area (sq. m)

No. Fans Rooms

Exhaust Flow Rate (L/s)

Flow Rate Per Fan (L/s)

This tool allows you to calculate the required ventilation for two types of rooms and a car park. Follow these simple steps:

For the **H.T. & L.T. Rooms**, select the room type from the dropdown. The default dimensions will load automatically, but you can change them.
For the **Car Park**, enter the dimensions of the car park.
The calculated values will appear automatically in the result boxes as you type or change the inputs.
Click the **"Print"** button below each section to generate a print-friendly version of that specific part of your calculations.

**Room Volume ($m^3$)**: $L times W times H$
**Room Volume ($ft^3$)**: $Room Volume (m^3) times 35.3147$
**Ventilated Air Quantity ($ft^3$/Hr)**: $Room Volume (ft^3) times Air Change/Hr$
**Ventilated Air Quantity (CFM)**: $Ventilated Air Quantity (ft^3/Hr) / 60$

**Exhaust Flow Rate (L/s)**: $(Air Change/Hr times Parking Height times Parking Area times 1000) / 3600$
**Flow Rate Per Fan (L/s)**: $Exhaust Flow Rate (L/s) / No. of Fans$

All calculations are estimates based on the provided inputs. The final design should always be verified by a qualified professional.