A room’s overall air volume flow can also be determined as a first approximation by using the ventilation rates. This in particular is “only” permissible in ventilation systems who do not require any particular air conditioning regarding humidity and temperature and air replacement is mostly covered by a sufficient outdoor air rate. The ventilation rate specifies how many times per hour the room volume is turned over (replaced). According to room use and the desire for air replacement, the ventilation rate varies (table).
