& Heat Recovery (MVHR)
Mechanical Ventilation with Heat Recovery (MVHR) can be used for properties built or refurbished to current Building Regulations Part F and L standards where air permeability can be down to 3 to 4 m3/h at 50pa pressure difference.
Every one of us exhales 10 to 75 litres of CO2 per hour and up to 175 grams of water per hour. A family of four produces 10-15 litres of water vapour a day through breathing, washing, showering and cooking.
The MVHR system extracts warm moist air via ducts to wet rooms and passes this air through a heat recovery cell before it is discharged outside. At the same time fresh air from outside is drawn through the cell where it is warmed and distributed to the living rooms and bedrooms.