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Unintended consequences


Penny Jones of Domus Ventilation looks at how improvements in the energy efficiency of dwellings has led to poor indoor air quality, and why mechanical ventilation is the way forward


well; so much so, that we’ve created airtight homes that, in some circumstances, over heat and trap the stale, humid air indoors along with the pollutants. But what we’ve failed to do is match the improvement in energy efficiency with the provision of ventilation. As well as making for an uncomfortable home environment, poor ventilation


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can directly affect the health of residents. Poor indoor air quality (IAQ) has known links to allergies, asthma, lung cancer, chronic obstructive pulmonary disease, cardiovascular disease and even dementia. ‘Why not just open a window or two if you need ventilation’ is a common


refrain, but in cooler or damp weather that’s not ideal, nor is it enough in warmer summer months. That’s where continuous mechanical ventilation systems steps in.


ver recent years we’ve done a good job of improving the energy efficiency of new build homes, with a focus on sealing the building envelope to prevent wasteful heat leakage. And it’s worked remarkably


As well as making for an uncomfortable home environment, poor ventilation can directly affect the health of residents


CONTINUOUS MECHANICAL VENTILATION Building Regulations Approved Document F details the different types of ventilation suited to a domestic property starting from a System 1 which is Intermittent Extract Ventilation, but for whole house continuous mechanical ventilation systems you are looking at a choice between a System 3 Continuous Mechanical Extract Ventilation (MEV) or a System 4 Continuous Mechanical Ventilation with Heat Recovery (MVHR). 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


www.housingmmonline.co.uk | HMM December/January 2020 | 25


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