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70 TRG-TRC007-EN
1 Hertz (cycles per second)
2 A sound at a single frequency. A sound at a narrow band of frequencies
that is significantly greater than the sound at adjacent frequencies would
be similar to a tone.
3 Sound pressure
4 A-weighted sound-pressure level is better for describing outdoor sound
5 Noise Criteria rating is better for describing sound in an office or classroom
6 NC-35 (see Figure 75)
7 False
8 True
9 Receiver sound correction (or room effect)
10 Reverberant
11 ARI Standard 260–2001, Sound Rating of Ducted Air Moving and
Conditioning Equipment
NC
NC
-
-
15
15
NC
NC
-
-
20
20
NC
NC
-
-
25
25
NC
NC
-
-
30
30
NC
NC
-
-
35
35
NC
NC
-
-
40
40
NC
NC
-
-
45
45
NC
NC
-
-
50
50
NC
NC
-
-
55
55
NC
NC
-
-
60
60
NC
NC
-
-
65
65
70
70
50
50
40
40
30
30
20
20
10
10
sound pressure, dB ref 20
sound pressure, dB ref 20
m
m
Pa
Pa
80
80
60
60
octave
octave
-
-
band frequency, Hz
band frequency, Hz
63
63
125
125
250
250
500
500
1,000
1,000
2,000
2,000
4,000
4,000
8,000
8,000
NC
NC
-
-
35
35
Figure 75
Answers