Ventilation
Penny Jones, Product & Marketing Manager at Domus Ventilation
ith buildings becoming increasingly air tight in a drive to improve energy efficiency and lower carbon emissions, the need for ‘pro-active’ ventilation has never been
greater. It represents a genuine growth sector and one in which electricians are increasingly looking to move into. Here we explain the main ventilation systems and the four top things you need to know that impact system selection.
Breathing Lifeinto a Home W
kitchen, 8l/s from each bathroom/utility area and supply at the same rate. Clearly opening a window is never going to achieve this, which is where mechanical ventilation steps in.
Why Ventilate? By correctly ventilating a property, fresh external air is brought in, airborne pollutants (including odours) are diluted and removed and excess humidity controlled. Every single person reading this will know what it’s like to be in a poorly ventilated room, whether it be hot and stuffy or damp from condensation. It not only makes for an uncomfortable home environment but poor indoor air quality (IAQ) also has known links to allergies, asthma, lung cancer, chronic obstructive pulmonary disease, cardiovascular disease and even dementia.
Ventilation Requirements Building Regulations Approved Document F, which details the means of ventilation in new and materially altered properties, sets the minimum continuous extraction requirement for domestic properties at 13l/s from the
20 | electrical wholesalerSeptember 2019
Types of Ventilation Systems There are four ventilation types suitable for a domestic property: ●System 1 - Intermittent Extract Ventilation ●System 2 – Passive Stack Ventilation ●System 3 - Continuous Mechanical Extract Ventilation (MEV) ●System 4 - Continuous Mechanical Ventilation with Heat Recovery (MVHR)
To achieve the levels of extraction required under Building Regulations,
MEV and MVHR whole house ventilation systems are necessary in most cases.
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 systems are typically dual speed, providing low speed continuous trickle ventilation and high-speed boost flow. Replacement fresh air is drawn into the property via background ventilators located in the habitable rooms and through air leakage. 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. MVHR systems efficiently temper the fresh air drawn into
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