University of Minnesota Fan Selection for Grain Bins

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Bin and Crop Inputs
Select a crop: Bin Diameter, feet:
Floor Type:
Grain Depth, feet:
Desired airflow (cfm/bu):

Estimated Fan Requirements

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(to get desired airflow when bin is full)
Bin capacity (bushels): 5,542
Total airflow (cfm): 5,542
Estimated static pressure (inches of water): 7.12
Estimated fan power needed (hp): 10.34

Fan Selection

 Show Fan Data
Select a fan:
Fan arrangement:
Number of fans on bin: 

Results
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Crop : Barley; Bin Diameter, feet: 21
Floor: Full
Airflow, cfm/bu: 1
Fan: 1 - 0.33 hp AEROVENT 1240-DW | 12" (Axial) arranged in Parallel

* Actual airflow differs from desired airflow by more than 5% at the desired depth.
Try using a shallower depth or a different fan.

Airflow and Pressure with Different Quantities of Grain in a Bin
Depth (ft)BushelsAirflow (cfm)Airflow (cfm/bu)S.P. (in. H2O)
25542,0083.620.21
41,1081,8821.700.39
61,6631,7531.050.53
82,2171,6000.720.64
102,7711,4730.530.73
123,3251,3660.410.81
143,8791,2740.330.87
164,4331,1940.270.93
184,9881,1240.230.98
205,5421,0680.191.03
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Crop : Barley; Bin Diameter, feet: 21
Floor: Full
Airflow, cfm/bu: 1
Fan: 1 - 0.33 hp AEROVENT 1240-DW | 12" (Axial) arranged in Parallel

* Actual airflow differs from desired airflow by more than 5% at the desired depth.
Try using a shallower depth or a different fan.

Airflow Graph
Green dashed line = Desired Airflow
Print

Crop : Barley; Bin Diameter, feet: 21
Floor: Full
Airflow, cfm/bu: 1
Fan: 1 - 0.33 hp AEROVENT 1240-DW | 12" (Axial) arranged in Parallel

* Actual airflow differs from desired airflow by more than 5% at the desired depth.
Try using a shallower depth or a different fan.