Acoustic Data - Lennox NEOSYS NAC 200 Application Manual

ACOUSTIC DATA

IMPORTANT NOTE : Thanks to variable speed fans, maximum sound level can be reduced.
NEOSYS maximum air fl ow can be adjusted between 70 % and 100 % of the nominal airfl ow to meet
maximum sound level requirements.
Please contact LENNOX for noise level calculations at reduced airfl ow.
Spectrum per octave band dB(A)
125 250
NAC
Hz Hz
200
68 79
230
68 80
270
68 80
300
70 82
340
70 82
380
70 82
420
71 83
480
71 83
540
71 83
600
72 83
640
72 83
680
73 85
760
73 85
840
74 86
960
74 86
1080
74 86
Spectrum per octave band dB(A)
125 250
NAH
Hz Hz
200
68 79
230
68 80
270
70 82
300
70 82
340
70 82
380
71 83
420
71 83
480
71 83
(1) : For information only: Data calculated by enveloping envelopping surface method in free open fi eld.
h+d
L+ 2d
• 32 •
500 1000 2000
Hz Hz Hz
83 85 82
84 85 82
84 85 83
85 87 84
85 87 84
86 87 84
87 88 85
87 88 86
87 89 87
88 90 88
88 90 88
88 90 87
89 90 88
90 91 88
90 91 89
90 92 90
500 1000 2000
Hz Hz Hz
83 85 82
84 85 82
85 87 84
85 87 84
85 87 84
87 88 85
87 88 85
87 88 86
Enveloping Surface
d
l+ 2d
d
Maximum global sound
power
4000 8000 EUROVENT
Hz Hz
Lw dB(A)
75 68
76 68
76 68
78 70
78 70
78 70
79 71
79 71
80 71
81 72
81 72
81 73
81 73
82 74
82 74
83 74
Maximum global sound
power
EUROVENT
4000 8000
Hz Hz
Lw dB(A)
75 68
76 68
78 70
78 70
78 70
79 71
79 71
79 71
A = 2(L+2d)(h+d)+2(l+2d)(h+d)+(L+2d)(l+2d)
Maximum sound
pressure at 10 meters
envelopping surface
(1)
Lp dB(A)
89
58
89
58
89
58
91
60
91
60
91
60
92
61
92 61
93
62
94
63
94
63
94
63
94
63
95
64
95
64
96 65
Maximum sound
pressure at 10 meters
envelopping surface
(1)
Lp dB(A)
89
58
89
58
91
60
91
60
91
60
92
61
92
61
92
61
Application Guide / NEOSYS-AGU-1801-E
NAC
NAH