Page 12
E−Blower Table Notes
Blower tables include resistance for base units only with
two−row dry indoor coil and air filters in place. For all other
units:
Determine total system design static pressure, then add:
1− Wet indoor coil air resistance of selected unit.
2− Any factory installed options air resistance (electric
heat, economizer, etc.). See table 4.
3− Any
field
installed
accessories
air
resistance
(horizontal roof frame, diffuser, etc.). See tables 5
through 9.
Use the blower table to determine blower motor
output and drives required.
F−Field−Furnished Blower Drives
For field−furnished blower drives, use tables 2 or 3 to
determine BHP and RPM required. Reference table 10 to
determine the drive number and table 11 to determine the
manufacturer’s model number.
TABLE 4
ACCESSORY AIR RESISTANCE
Air Volume
Total Resistance K inches water gauge (Pa)
Air Volume
Wet Indoor Coil
cfm
L/s
LCA/LGA
036S/036H/042S/
042H/048S/060S
LCA/LGA
048H/060H/072S
LCA/LGA072H
Electric Heat
(LCA Models)
Economizer
800
380
0.02 (4)
0.04 (9)
0.05 (13)
0.04 (10)
0.04 (10)
1000
470
0.02 (4)
0.05 (12)
0.07 (18)
0.06 (15)
0.04 (10)
1200
565
0.03 (8)
0.06 (16)
0.09 (24)
0.09 (22)
0.04 (10)
1400
660
0.04 (10)
0.08 (21)
0.12 (31)
0.12 (30)
0.04 (10)
1600
755
0.05 (13)
0.10 (26)
0.15 (38)
0.16 (40)
0.04 (10)
1800
850
0.06 (16)
0.12 (31)
0.18 (46)
0.21 (52)
0.05 (12)
2000
945
0.07 (18)
0.14 (36)
0.21 (53)
0.25 (62)
0.05 (12)
2200
1040
0.09 (21)
0.17 (42)
0.25 (62)
0.31 (77)
0.05 (12)
2400
1135
0.11 (27)
0.19 (48)
0.28 (70)
0.37 (92)
0.05 (12)
2600
1225
0.013 (32)
0.22 (54)
0.31 (77)
0.43 (107)
0.06 (15)
2800
1320
0.16 (40)
0.25 (63)
0.36 (88)
0.50 (125)
0.06 (15)
3000
1415
0.20 (50)
0.29 (71)
0.41 (101)
0.58 (144)
0.06 (15)
TABLE 5
CEILING DIFFUSER AIR RESISTANCE
Air Volume
Total Resistance K inches water gauge (Pa)
Air Volume
RTD9 StepDown Diffuser
FD9 Flush
RTD11 StepDown Diffuser
FD11
cfm
L/s
2 Ends
Open
1 Side
2 Ends Open
All Ends &
Sides Open
FD9 Flush
Diffuser
2 Ends
Open
1 Side
2 Ends Open
All Ends &
Sides Open
FD11
Flush
Diffuser
800
380
0.15 (37
0.13 (32)
0.11 (27)
0.11 (27)
− − − −
− − − −
− − − −
− − − −
1000
470
0.19 (47
0.16 (40)
0.14 (35)
0.14 (35)
− − − −
− − − −
− − − −
− − − −
1200
565
0.25 (62
0.20 (50)
0.17 (42)
0.17 (42)
− − − −
− − − −
− − − −
− − − −
1400
660
0.33 (82
0.26 (65)
0.20 (50)
0.20 (50)
− − − −
− − − −
− − − −
− − − −
1600
755
0.43 (107
0.32 (80)
0.20 (50)
0.24 (60)
− − − −
− − − −
− − − −
− − − −
1800
850
0.56 (139
0.40 (100)
0.30 (75)
0.30 (75)
0.13 (32)
0.11 (27)
0.09 (22)
0.09 (22)
2000
945
0.73 (182
0.50 (125)
0.36 (90)
0.36 (90)
0.15 (37)
0.13 (32)
0.11 (27)
0.10 (25)
2200
1040
0.95 (237
0.63 (157)
0.44 (110)
0.44 (110)
0.18 (45)
0.15 (37)
0.12 (30)
0.12 (30)
2400
1135
− − − −
− − − −
− − − −
− − − −
0.21 (52)
0.18 (45)
0.15 (37)
0.14 (35)
2600
1225
− − − −
− − − −
− − − −
− − − −
0.24 (60)
0.21 (52)
0.18 (45)
0.17 (42)
2800
1320
− − − −
− − − −
− − − −
− − − −
0.27 (67)
0.24 (60)
0.21 (52)
0.20 (50)
3000
1415
− − − −
− − − −
− − − −
− − − −
0.32 (80)
0.29 (72)
0.25 (62)
0.25 (62)
