How to calculate the necessary fan capacity for a room
((room volume in m³) + (30% of the room volume since the filter might reduce the performance ) ) * desired air exchange frequency.If we assume a room size of 20m³ and we want to exchange the air 12 times per hour we get the following result:
(20 + 20/100 * 30) * 12 = 312m³
Thus, we need a fan that has at least the power to achieve the air flow of 312m³ per hour. Yet, this calculation applies only to duct hoses less than 1m long. If they are longer, you need to take the length into account also. So for let's say 3m long hoses you calculate:
( (20 + 20/100 * 30) + 3) * 12 = 348m³
You'll need a fan with a power of approx. 350m³ per hour.