ᐅ How many cubic meters per hour do I need for good indoor air quality?

Hello everyone,

I have read a lot about controlled residential ventilation with heat recovery, but I still don’t fully understand the following:

How many cubic meters per hour (m³/h) of supply air are needed to ensure good, continuously fresh air in the various rooms, especially in the bedrooms throughout the entire night?

Here are my rooms with their typical usage and sizes. Maybe you have specific practical experience or calculation values:

Upstairs:
1. Parents’ bedroom (2 persons, 18 m² (194 ft²), 285 cm (9 ft 4 in) ceiling height)
2. Child’s bedroom (1 child, 18 m² (194 ft²), 285 cm (9 ft 4 in) ceiling height)
3. Study room (for 1 person, 10 m² (108 ft²), 285 cm (9 ft 4 in) ceiling height)

Downstairs:
4. Guest room (designed for 2 persons, 11 m² (118 ft²), 255 cm (8 ft 4 in) ceiling height)
5. Living room with an open L-shaped kitchen (ventilation should cover all 4 family members and possibly guests, total 55 m² (592 ft²), 255 cm (8 ft 4 in) ceiling height)

So far, I have read various recommendations ranging from 20 to 30 m³/h per person. But are these values intended for the respective person’s room?

Does that mean, for example, 2 x 30 m³/h = 60 m³/h for the parents’ bedroom?
And 4 x 30 m³/h = 120 m³/h for the living room?

Others calculate based on the room volume, but does this approach sufficiently consider the intensity of use?

What practical values or experiences do you have?

I want to ensure there is always good, fresh air in the bedrooms. The same applies to the children’s rooms as well as the “large” living room with the open kitchen. Especially in the living room, I am unsure what the appropriate air exchange rate in cubic meters per hour should be to adequately serve 4 adult family members plus occasional guests.

I hope you can help shed some light on this ;-)

Thanks in advance!