The angle/slope calculator has been updated.
Ventilation volume is calculated by multiplying the total volume of the space by the 'number of ventilations' required per hour.
CMH (Cubic Meter per Hour] is a standard unit representing the volume of air discharged or drawn in per hour.
Please check the items below to calculate the airflow accurately.
The recommended hourly ventilation rate varies depending on the level of pollutants generated in areas such as bathrooms, living rooms, dining rooms, and kitchens. Please select the item that suits your purpose.
Enter the floor area and ceiling height of the space to be ventilated. As the ceiling height increases, the total volume of air increases, so a larger capacity ventilation fan is required.
Select a fan with specifications slightly larger than the calculated recommended airflow. It is recommended to leave a margin of 10 to 20 percent to account for duct resistance.
Here are practical field tips to maximize ventilation performance.
Fresh air must enter to the same extent as air is expelled. If air is not drawn in through door gaps or windows, the ventilation fan's performance will rapidly deteriorate.
The longer the piping is or the more 90-degree bends it makes, the greater the resistance (static pressure], which reduces the airflow. It is most advantageous to install it as short and straight as possible.
In places like apartments or villas that use shared exhaust vents, backdrafts and resistance are severe, so it is recommended to use a powerful, high-pressure dedicated ventilation fan.