10
Static pressure [in. W.G.]
Air flow [CFM]
2.0
50
100
150
200
0.2
0.4
0.6
0.8
0
2 intakes
1 intake
2 intakes
1 intake
Static pressure [in. W.G.]
Air flow [CFM]
2.0
50
100
150
200
0.2
0.4
0.6
0.8
0
Static pressure [in. W.G.]
Air flow [CFM]
2.0
50
100
150
200
0.2
0.4
0.6
0.8
0
Air flow
[CFM]
2 intakes
1 intake
Static pressure [in. W.G.]
2.0
50
100
150
200
250
300
0.2
0.4
0.6
0.8
0
Air flow
[CFM]
2 intakes
1 intake
Static pressure [in. W.G.]
2.0
50
100
150
200
250
300
0.2
0.4
0.6
0.8
0
Air flow [CFM]
Static pressure [in. W.G.]
2.0
50
100
150
200
250
300
0.2
0.4
0.6
0.8
0
l
l
PLFY-P12 /P15 /P18 /P24NAMU-E
Multifunction ca Standard filter
2
2
PLFY-P30 /P36NAMU-E
Multifunction ca High efficiency filter
Taking air into the unit
Multifunction ca Standard filter
Multifunction ca High efficiency filter
Taking air into the unit
4-4. FRESH AIR INTAKE AMOUNT & STATIC PRESSURE CHARACTERISTICS
Q
0
B
A
C
1
Curve in the
left graphs.
Duct characteristics
at site
Q
A
EC
2
Q
Qa
AD
3
Q…Planned amount of fresh air intake
A…Static pressure loss of fresh air
intake duct system with air flow
amount Q
B…Forced static pressure at air condi-
tioner inlet with air flow amount Q
C…Static pressure of booster fan with
air flow amount Q
D…Static pressure loss increase
amount of fresh air intake duct sys-
tem for air flow amount Q
E…Static pressure of indoor unit with air
flow amount Q
Qa…Estimated amount of fresh air
intake with out D
<CFM>
<CFM>
<in.W.G.>
<in.W.G.>
<in.W.G.>
<in.W.G.>
How to read curves
<in.W.G.>
OC340A--1.qxp 06.7.25 0:39 PM Page 10
