Catalogue

38 UV-PRC004-EN
Performance Data
Table 28 reflects sound power ratings for the horizontal classroom unit ventilator. To calculate the
noise criteria (NC) for a unit, subtract the actual room effect from the sound power number in each
octave band. These numbers may be graphed on a NC chart.
Note: Because room affects vary greatly, request exact numbers per the specific job from the
design engineer. By obtaining these exact numbers, the most accurate results of the
installed unit may be calculated.
Data obtained in the reverberant rooms conforming to ANSI S12.31 and ANSI S12.32
Table 28. Horizontal octave band sound power ratings (sound power in db ref: 10
-12
watts)
Octave Band12345678
Center of Frequency 63 125 250 500 1000 2000 4000 8000
075 High Speed 66 67 61 60 56 53 48 41
075 Med Speed 62 63 57 56 52 49 44 37
075 Low Speed 59 60 54 53 49 46 41 34
100 High Speed 66 67 61 60 56 52 48 41
100 Med Speed 62 63 57 56 52 48 44 37
100 Low Speed 59 61 55 54 43 45 38 29
120 High Speed 70 71 65 64 60 56 51 44
120 Med Speed 66 67 61 60 56 52 47 40
120 Low Speed 63 64 58 57 53 49 44 37
150 High Speed 65 68 62 60 56 52 45 38
150 Med Speed 61 64 58 56 52 48 41 34
150 Low Speed 57 63 54 53 47 42 33 25
200 High Speed 73 75 68 64 60 57 53 45
200 Med Speed 67 69 62 58 54 51 47 39
200 Low Speed 64 74 59 60 49 45 37 29
Acoustical
UV-PRC004-EN.book Page 38 Monday, February 4, 2013 11:01 AM