Mixed-mode ventilation

The Illustrated Guide to Mechanical Building Services, Third Edition (BG 31/2017), by David Bleicher, published by BSRIA in 2017, states in relation to mixed-mode ventilation: ‘Mixed-mode is a term that describes a system which combines natural and mechanical ventilation. The mechanical element can be extract, supply or a combination of the two, however it is typically a supply system. The mechanical element ensures that an adequate air flow is maintained when natural ventilation is inadequate. This is particularly useful at night when it can be used to purge heat from the building in readiness for the next day (see diagram opposite). Mixed-mode systems have become increasingly popular in recent years. This is largely because greater reliance can be placed on them to provide ventilation in comparison to a natural ventilation system, while still providing the benefits of a natural ventilation system when weather conditions are suitable.’

--BSRIA

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