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OC194-15
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
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
PL12FK1
Hi
Lo
43
SPL(dB)
35
LINE
NOTCH
7. NOISE CRITERION CURVES
Airflow
Air speed
Coverage range
(CFM)
(ft / sec.)
(ft)
Standard
height
PL12FK
1
570
9.5
18
PL18FK2
1
680
11.3
21
PL24FK2
1
750
12.5
23
PL30FK2
1
1,170
10.5
27
PL36FK3
1
1,170
10.5
27
PL42FK2
1
1,270
11.4
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
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.002 MICRO BAR
BAND CENTER FREQUENCIES, Hz
PL18FK21
Hi
Lo
45
SPL(dB)
38
LINE
NOTCH