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Mechanical Ventilation & Heat Recovery (MVHR)

Mechanical Ventilation
& 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.

How does it work?

The system comprises a Heat Recovery Unit and a network of ducting which is connected to each room. It extracts warm moist air via ducts to the 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.

The ducting runs within the ceiling or floor space of the rooms, hidden from view, however this can present challenges from an installation point of view in running the ducting within the joisting system.

Installation within a Joist system

Minera’s open metal web joists – the solution to installing MHVR into your building without returning to the drawing board. Our open metal web joists (also referred to as (Posi-Joist | Ecojoist | Easi-Joist | Spacejoist) are specially designed with a central open metal web structure allowing for ease of access for trades whilst not compromising on strength. This is successfully used in all forms of construction, whether domestic, commercial or retail in the floor or in the roof as the benefits of overall build time surpasses all other systems when taking into account the follow-on trades.

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In mainland UK on trussed rafters and engineering joists.

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