Ventilation Systems
Modern homes are well insulated, trapping inside litres of water vapour from breathing, washing and cooking, as well as a build-up of odours. Without proper ventilation buildings become more susceptible to stagnant air, where bacteria and excess carbon dioxide make the indoor air more polluted than the air outside.
A well designed ventilation system will exchange stale indoor air with fresh air from outside, efficiently removing moisture, odours and pollutants. We spend the majority of our time indoors, making indoor air quality an important consideration in overall health. Read on to see the different systems that can deliver these healthy environments.
Mechanical Ventilation with Heat Recovery (MHVR)
MVHR (Mechanical ventilation with heat recovery) is a whole dwelling ventilation system that supplies and extracts air continuously at a low rate with the facility to be boosted as required meeting Building Regulations Part F . The unit is normally installed in the loft space or cupboard and rigid ducting supplies fresh filtered air to the habitable rooms and extracts stale polluted air from the ‘wet’ rooms.
Centralised Mechanical Extract Ventilation (MEV)
Centralised Mechanical Extract Ventilation (MEV) is a solution that extracts odours and humid air from wet rooms. A central unit, typically installed in loft spaces or cupboards, is connected to a dwelling's wet rooms via ducting. This means that there are no individual fans in each wet room. MEV is an ideal solution for new build but is also often used in retrofit applications.
Positive Input Ventilation (PIV)
The average family will produce around 15l of moisture per day from breathing (respiration), cooking, bathing, dishwashing, and drying clothes. Failure to remove this moisture can result in a build-up of damp and mould. This can result in health issues in particular for those with respiratory issues, asthma or allergies. Xpelair Everdri is a whole house ventilation control system for houses with a loft space.
Decentralised Mechanical Extract Ventilation (dMEV)
A decentralised Mechanical Extract Ventilation (dMEV) system incorporates continuously running fans, designed to remove odours and humid air out of single wet rooms such as bathrooms and kitchens. dMEV fans operate continuously in each wet room of the property. They run at a low (trickle) speed unless boost speeds are activated by either an external switch or humidity. Because the fans are always in operation they provide a fantastic method of ensuring properties are always well-ventilated.
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