Measuring air quantities and the number of air exchanges

The purpose of the test is to measure intake air quantities in the room, on the basis of which, considering the known space volume, it is possible to calculate number of air exchanges. Test is performed in accordance with ISO 14644-3 standard.

 Air quantity meter

We use several different methods for measuring air flow quantities. The simplest, quickest and clear is the method using the air quantity meter (measuring surface: 610x610mm) and measuring quantities directly on air intake filter units (distributors). After years of experiences and improvements of measuring equipment, this method became very reliable, accurate and consequently the most used one. In cases where because of the dimensions of air quantity meter direct access to the filter units isn’t possible or the size of individual air intake unit is bigger from above mentioned, measurement can be performed directly under the filter surface (air intake spot) and only in direct flow regime. For measuring, anemometers with hot wire and propeller anemometers are used. From known speed of air intake and surface of filters, air flow is calculated and afterwards number of air exchanges.

When measuring directly on the spot of air intake isn’t possible, we use measuring of air flow speed in air distribution canals, where based on known diameter of canal, we calculate air flow and afterwards number of air exchanges. Measurements are performed with Pitot tube, anemometer with hot wire and also propeller-canal anemometer.

We use measuring equipment from renowned manufacturers TSI, Testo.

All instruments are calibrated annually.