Ventilation
MVHR Systems: What You Need To Know
With a growing awareness of the dangers of poor indoor air quality, effective ventilation has become a key component of the energy and sustainability agenda and Mechanical Ventilation with Heat Recovery (MVHR) systems are an increasingly popular solution for new build and refurbished properties. Here Lee Stones, senior product marketing manager at Glen Dimplex Heating & Ventilation, which includes the Xpelair brand, tells you all you need to know.
What is an MVHR system?
insulation levels are high. Available as a centralised heat exchange system, the proven technology extracts moist, stale air from inside the property and replaces it with fresh, incoming air. Crucially, it uses heat from the outgoing air to
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warm the incoming air, with high efficiency systems able to warm air up to more than 90% of the internal air temperature.
How does it work? Correct specification is key. Heat recovery is a system comprising two components – the heat exchange unit and the ducting. The design and quality of both is equally important in achieving maximum performance. Because the heat exchange unit is often installed in an isolated space, equally important is how the device is connected to the spaces within the building requiring ventilation. Since the role of the system is to remove stale air and
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echanical Ventilation with Heat Recovery (MVHR) systems are ideal for buildings where
replace it with fresh air, the suitability of the ducting that travels in and out of the unit is vital. Appropriate specification of the MVHR unit and the ducting to operate alongside it requires an overall design view, in the context of the property it is destined for, to ensure the correct heat exchange unit and optimum ducting is selected. If you specify a certain duct run, the MVHR unit
needs to be able to be operate effectively alongside it. If excessively long ducting is used or the duct has too many bends or a completely inappropriate type of duct is fitted (for example flexi ducting) then an MVHR unit will not be able to perform correctly. This is why our dedicated in-house Xpelair
System Design Service works with clients, reviewing their building design and ventilation requirements to help them get this right.
What are the main benefits of an MVHR system? Part F of the Building Regulations states that there are four categories of ventilation product that an installer can choose from: Intermittent
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