Air Pressure Drops- Cabinets, Filters, Wet Coils 
Cabinet And Filter Air Pressure Drop
| Air Pressure Drop - inches of water |
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| Air Velocity^ - Feet per minute |
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| 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 |
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| 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 |
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| 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 |
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| 37" Depth | — | — | .22 | .29 | .36 |
| .44 | .54 | .60 | .68 |
High | (60 - 65%) Cartridge Filter | 6" Depth | .15 | .20 | .26 | .33 | — |
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| 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 | — |
| — | — | — | — |
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| 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* |
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Rows | Fin | Air Velocity - Feet | per minute^ |
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| Rows | Fin | Air Velocity - Feet | per minute^ |
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| Series | 400 | 450 | 500 |
| 550 | 600 | 650 |
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| Series | 400 | 450 | 500 |
| 550 | 600 | 650 |
| 6 | 0.18 | 0.22 | 0.26 |
| 0.30 | 0.34 | 0.39 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 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 |
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| 14 | 1.25 | 1.51 | 1.78 |
| 2.06 | 2.36 | 2.68 |
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*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.
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