York YHKJXH012BAM--FX Service Manual page 136

External static pressure ( Pa )
140
130
120
110
100
90
80
70
60
50
40
0 300 600 900
YHGJXH048BAR--GX
1
2
3
1200 1500 1800 2100 2400
136
external static pressure curves
Air flow （ m /h ）
2700 3000
high speed
1
m id speed
2
low speed
3
3