Determination of Sound Power Levels of Air Terminal Units According to ISO 5135-Nordic Inter-Laboratory Tests. Nordtest Project No. 968-91. Nordtest Technical Report No. 214

摘要

An inter-laboratory test program to determine the sound power level of airterminal units was carried out. The measurements were performed in accordance with ISO 5135. Four laboratories participated, each carrying out measurements on six test objects: two non-adjustable air terminal units, two adjustable air terminal units and two dampers. The diameters of the chosen units were 125 and 250 mm. The statistical basis for firm conclusions has not been satisfactory. One of the participating laboratories was unable to measure on such low flow rates as those used for the test objects chosen for this investigation and two of the test objects were damaged during the transportation between the participating laboratories.