41
Air Pressure Drops- Cabinets, Filters, Wet Coils
Cabinet And Filter Air Pressure Drop
Air Pressure Drop - inches of water
Air Velocity^ - Feet per minute
Component
200
250
300
350
400
450
500
550
600
Cabinet:
V Style Cabinet^^
—
—
—
.10
.13
.16
.20
.24
.29
Economizer Section^^
—
—
.02
.03
.03
.04
.05
.06
.07
Filters:
Throwaway
2" Depth
.05
.08
.11
.15
.19
.24
.28
—— ——
flat & hi
35% Efficient , Pleated
2" Depth
.08
.10
.13
.16
.21
.25
.30
.37
——
capacity
Permanent, Aluminum, Cleanable
2" Depth
.03
.04
.06
.08
.10
.13
.15
.18
.21
flat, 4"
35% Efficient , Pleated
4" Depth
.06
.07
.10
.13
.17
.20
.25
.29
.34
(60 - 65%) Efficient
21" Depth
.12
.16
.21
.26
.32
.38
.45
—
—
Filters:
Bag Filter
30" Depth
—
—
.19
.24
.28
.33
.37
.41
.44
37" Depth
—
—
.12
.17
.23
.27
.33
.37
.41
Medium
(80 - 85%) Efficient
21" Depth
.14
.20
.26
.32
.38
.44
.51
—
—
Bag Filter
30" Depth
—
—
.23
.28
.34
.40
.47
.51
.55
37" Depth
—
—
.15
.21
.26
.32
.38
.45
.52
and
(90 - 95%) Efficient
21" Depth
.20
.28
.36
.44
.52
.61
.70
—
—
Bag Filter
30" Depth
—
—
.32
.39
.46
.53
.60
.66
.72
37" Depth
—
—
.22
.29
.36
.44
.54
.60
.68
High
(60 - 65%) Cartridge Filter
6" Depth
.15
.20
.26
.33
—
—
—
—
—
12" Depth
—
—
.22
.28
.34
.41
.50
.58
.68
(80 - 85%) Cartridge Filter
6" Depth
.22
.29
.37
.46
—
—
—
—
—
Efficiency
12" Depth
—
—
.26
.32
.38
.46
.55
.64
.74
(90 - 95%) Cartridge Filter
6" Depth
.25
.34
.44
.56
—
—
—
—
—
12" Depth
—
—
.29
.35
.42
.50
.59
.70
.82
The filter air pressure drop is for air through clean filters.
Type A (1/2" O.D.) Wet Coil Air Pressure Drop* Type 5 (5/8" O.D.) Wet Coil Air Pressure Drop*
Rows
Fin
Air Velocity - Feet per minute^
Rows
Fin
Air Velocity - Feet per minute^
Series 400
450
500
550
600
650
Series
400
450
500
550 600
650
6
0.18 0.22 0.26 0.30 0.34
0.39
6
0.25
0.30
0.36
0.42 0.49 0.56
8
0.22 0.27 0.32 0.37 0.42
0.48
8
0.31
0.37
0.44
0.52 0.60 0.68
3
10
0.26 0.32 0.37 0.43 0.50
0.56
3
10
0.36
0.44
0.52
0.58 0.67 0.79
12
0.30 0.37 0.43 0.50 0.57
0.65
12
0.42
0.50
0.59
0.66 0.76 0.87
14
0.34 0.41 0.49 0.56 0.64
0.73
14
0.45
0.54
0.64
0.74 0.85 0.97
6
0.24 0.29 0.35 0.40 0.47
0.53
6
0.33
0.40
0.48
0.56 0.65 0.74
8
0.30 0.36 0.43 0.50 0.57
0.65
8
0.41
0.50
0.59
0.69 0.80 0.91
4
10
0.35 0.43 0.51 0.59 0.67
0.77
4
10
0.48
0.58
0.69
0.81 0.93 1.06
12
0.41 0.49 0.58 0.68 0.77
0.88
12
0.56
0.67
0.79
0.92 1.02 1.20
14
0.46 0.56 0.66 0.76 0.87
0.99
14
0.63
0.75
0.89
1.03 1.14 1.34
6
0.31 0.38 0.45 0.53 0.61
0.70
6
0.41
0.50
0.60
0.70 0.81 0.93
8
0.39 0.47 0.56 0.65 0.74
0.84
8
0.51
0.62
0.74
0.86 0.99 1.13
5
10
0.46 0.55 0.65 0.75 0.86
0.97
5
10
0.60
0.73
0.87
1.01 1.12 1.32
12
0.53 0.63 0.74 0.85 0.97
1.10
12
0.69
0.84
0.99
1.11 1.27 1.50
14
0.59 0.71 0.83 0.95 1.09
1.22
14
0.78
0.94
1.11
1.24 1.42 1.68
6
0.37 0.46 0.54 0.64 0.74
0.84
6
0.49
0.60
0.72
.84 0.98 1.12
8
0.46 0.56 0.67 0.78 0.90
1.03
8
0.61
0.74
0.88
1.03 1.19 1.36
6
10
0.55 0.67 0.79 0.92 1.05
1.18
6
10
0.72
0.88
1.04
1.21 1.40 1.59
12
0.63 0.77 0.90 1.04 1.19
1.34
12
0.83
1.01
1.19
1.38 1.59 1.80
14
0.72 0.86 1.01 1.17 1.33
1.49
14
0.94
1.13
1.33
1.55 1.77 2.01
6
0.51 0.62 0.74 0.87 0.99
1.12
6
0.66
0.80
0.96
1.12 1.30 1.49
8
0.63 0.77 0.90 1.05 1.20
1.35
8
0.82
0.99
1.18
1.38 1.59 1.82
8
10
0.75 0.90 1.06 1.23 1.40
1.58
8
10
0.97
1.17
1.39
1.62 1.86 2.12
12
0.86 1.03 1.21 1.40 1.59
1.79
12
1.11
1.34
1.58
1.84 2.12 2.41
14
0.96 1.15 1.35 1.56 1.78
2.01
14
1.25
1.51
1.78
2.06 2.36 2.68
* Wet coil air pressure drop for air entering at 80 °F DB and 67 °F WB over rippled high efficiency fins. Inches of water.
^ Air velocity = CFM divided by coil or filter face area in square feet. See table at top of page 40.
^^ Use face area of large coil to calculate air speed through AHV cabinet and economizer section.
