When there is no domestic hot water load the Modul-AIR AQUA operates as a standard cMEV system. The ventilation rates are in line with Part F (Ireland, England, Wales) and Part CCC (Scotland) boost and trickle rates. Boost can be provided via a number of options such as manual, humidity or CO2. When domestic hot water demand the ventilation rate increases to boost level. The energy is extracted from the stale air and the now cool air is exhausted to outside.
Fresh air is passively drawn into the habitable rooms of the dwelling via suitably sized natural vents.