Mechanical Ventilation Heat Recovery (MVHR) units, ducting, grills and vents, system design service. In Passivhaus projects it is essential to specify MVHR units that have certified by the Passivhaus Institute (PHI).
The Passivhaus Handbook - a practical guide to constructing and retrofitting buildings for ultra-low-energy performance by Janet Cotterell and Adam Dadeby - published by Green Books.
