OC246-14
P
90
80
70
60
50
40
30
20
10
63
125
250
500
1000
2000
4000
8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCT
A
VE B
AND SOUND PRESSURE LEVEL,
dB re 0.002 MICR
O B
A
R
BAND CENTER FREQUENCIES, Hz
PL12AK
Hi
Lo
32
SPL(dB)
27
LINE
NOTCH
7. NOISE CRITERION CURVES
P
Airflow
Air speed
Coverage range
(CFM)
(ft / sec.)
(ft)
Standard
height
PL12AK
560
12.5
16
PL18AK
710
13.1
19
PL24AK
990
16.1
24
PL30AK
1,060
17.1
26
PL36AK
1,060
21.7
29
PL42AK
1,060
21.7
29
•The air coverage range is the value up to the position where the air speed is 0.8ft/sec. when
air is blown out horizontally from the unit at the High fan setting.
The coverage range should be used only as a general guideline since it varies according to
the size of the room and furniture installed inside the room.
6.OUTLET AIR SPEED AND COVERAGE RANGE
90
80
70
60
50
40
30
20
10
63
125
250
500
1000
2000
4000
8000
APPROXIMATE
THRESHOLD OF
HEARING FOR
CONTINUOUS
NOISE
NC-60
NC-50
NC-40
NC-30
NC-20
NC-70
OCT
A
VE B
AND SOUND PRESSURE LEVEL,
dB re 0.002 MICR
O B
A
R
BAND CENTER FREQUENCIES, Hz
PL18AK
Hi
Lo
37
SPL(dB)
31
LINE
NOTCH
