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How Does MVHR Work?

Mechanical Ventilation with Heat Recovery continuously take stale, polluted and warm air from rooms such as bathrooms and kitchens, and the redistribute the filtered, clean air into the working or living area rooms.

Inside the ventilator, there is a central heat exchanger in which the polluted air is taken through and the heat energy is recovered. This heat energy is then transferred to the new, clean air.

What is involved?

Heat Recovery Ventilation is a system that includes a ducting network that is connected to each room, and a Heat Recovery unit.

Typically, in the loft area or in a plant room, there will be an air-handling unit and a collection of dual pair-ducting to every room in which filtered air is required.

One line of the ducting is used to remove the polluted air and the second line of ducting replaces it with filtered air.

The heat exchanger is located inside the air handling unit, and the heat recovery function operates when the warm, unfiltered air flows through the exchanger and the heat is extracted. This is then used to warm the cooler fresh air being drawn in from outside. This process maintains up to 90% of the heat in the room.

The dual ducting is ordinarily 100mm to 150mm in diameter, depending on the size of the property, it is fully insulated, and can also be either rigid or flexible.


Running Costs

There is a minor running cost of no more than £30 a year due to the system being electrically powered.


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