This method determines the overall function of the ventilation system by measuring the carbon dioxide, CO2 generated by the occupants. The primary intention is to measure the room air concentration, CR with one gas analyser. However by using two or more gas analysers the effectiveness or local ventilation index can also be obtained.
The scope of this Nordtest method is to determine the sensed draught (combination of local air velocity and low air temperature) created by incoming air through vents for direct supply of outdoor air into a room.
Ventilation filters are normally classified with the aid of standard laboratory tests. The most well known standards are the European standard EN779 (Anon. 1993) and the corresponding American standard ASHRAE 52.2 (Anon. 1999). Standard tests, however, produce information which may be insufficient for estimating the true filter performance.
The method describes a test arrangement and procedure for measuring transmission loss without flow of duct-mounted air terminal devices. This is a laboratory substitution method, which is to be applied in a reverberation room.
Nordtest is a trademark of Nordic cooperation in conformity assessment. The emphasis of Nordtest is to develop, promote and innovate Nordic test methods and pre-normative activity. Nordtest endeavours to remove technical barriers to trade and promotes the concept: “Approved once, accepted everywhere”.