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ČSN EN 14134 This document specifies checks and measurement methods in order to verify the fitness for purpose of installed ventilation systems in dwellings. It can be applied to commissioning of new systems and performance testing of existing systems. It provides choice between simple test methods, when sufficient, and extensive measurements, when necessary. Considering that this document has been developed for large scale application and considering the practical conditions of field measurements, no correction regarding ambient conditions (temperature and barometric pressure) is applied to functional measurements. This document deals with items d), e), f), and g) of the following list giving the different stages of the design, installation, checking and measuring of a ventilation system: a) design and dimensioning of residential system; b) installation of system; c) balancing and adjustment of system; d) pre-checks on system; e) functional checks on system; f) functional measurements on system; g) special measurements on system if required. This document applies to ventilation systems (mechanical, hybrid, natural) comprising any of the following elements: - air terminal devices (supply, extract, intake and exhaust); - air transfer devices (externally mounted, internally mounted); - controls; - ducts; - fans; - filters; - heat recovery; - heating/cooling of supply air; - recirculation air; - cooker hood; - cowls; - dampers; - sound reduction devices. In case of multi-functional units, the checking and measuring only apply to the ventilation part. Therefore, this document does not apply to: - heating systems and their control; - refrigerating systems and their control; - electrical power supply systems. It does not cover the following points: - airtightness of the building envelope; the whole dwelling and the individual room ventilation rates can be influenced by air infiltration through the building envelope (see EN ISO 9972); - effect of the ventilation system on indoor air speed within the occupied zone (see for example EN 15726).