Ventilation An MEV system actively
extracts air from ‘wet rooms’ (kitchens, bathrooms, utility spaces) via ducting to a central
ventilation unit which further ducts to an exhaust point.
the building with heat attained from waste stale air using a heat exchanger; up to 95% of waste heat can be recovered by this mechanism. The filtered, pre-warmed air is then distributed around the home, effectively meeting part of the heating load in energy efficient dwellings.
Key Considerations
All new homes can benefit from mechanical ventilation, but there are some aspects that it’s important for customers to consider when specifying a system and that you should bring up with them. Some of these will also impact what equipment to stock.
Size: in larger properties, you have a far wider range of options in terms of the unit to use, where it’s located and how/where the ducting is run. In smaller properties, that choice is reduced.
Installation of the main MEV/MVHR unit in the loft used to be common practice, but with access issues and potential problems caused by lower temperatures in the loft, most units are now wall mounted within the heated envelope of the property; most commonly in a cupboard. The size of the unit therefore needs to be compact, especially when it comes to height; the Domus Ventilation HRXE MVHR, for example, is just 507mm in height. Where installation in a cupboard is not an option, then a ceiling void should be a consideration. Here the depth of the unit and weight are key factors. The Domus Ventilation HRX-aQ is the shallowest in the market place, measuring down to 199mm in depth and weighing from just 7.9kg, making it compact and light enough to be easily installed in the most restrictive of ceiling voids.
Noise: nothing annoys a homeowner quite as much as being kept awake by a noisy appliance or building service. Mechanical ventilation systems aren’t silent but they can be very quiet. Opt for a system that generates less than 24dBA (typically whisper quiet) at a distance of more than one meter
away from the air valve. Also, recommend the use of an Anti-Vibration tray and duct sound attenuators to further reduce system noise; this is also a good upsell opportunity.
Ducting: poor ducting (and that relates to the product quality, the duct run design and installation) impacts the air flow, sound and overall effectiveness of a system. Stock quality ducting that fits together to minimise air leakage.
HRXD MVHR plan
Also suggest Radial semi-rigid ducting system when fitting MVHR systems – especially good in small spaces. Radial systems allow each room vent to be served by single or twin duct runs which connect directly to the central distribution system, evenly splitting the air from the MVHR unit. Some manufacturers enable you to combine both types of ducting through the use of special adaptors, for a versatile solution where lack of space or tight void areas are an issue. Once again, this is a good upsell opportunity and for installers that are not well versed in ventilation this is far easier to fit. Polluted areas: inner-cities have higher concentrations of pollution so bringing that air into a property may meet Building Regulations, but it’s not good for the inhabitants. Here an MVHR system is ideal as they come with filters to remove pollutants. If you are based in a city, then bringing this to customers’ attention is helpful.
Continuous Mechanical Ventilation systems have never been so popular. Look at any of the property shows on TV these days and you can bet a mechanical ventilation system will be part of the house specification in one form or another. Consider expanding your ventilation range and knowledge from basic bathroom fans to mechanical ventilation to take advantage of this growth sector.
domusventilation.co.uk Unlike MEV, MVHR systems
combine supply and extract ventilation in one system.
They work on the principle of extracting and re-using waste heat from wet rooms.
ewnews.co.uk September 2019 electrical wholesaler | 21 CMX-S MEV plan
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