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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.