Fan and Filter Seperation Dist.?

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The discussion focuses on designing ventilation for pump stations in a water pipeline project, emphasizing forced air cooling without air conditioning. A key concern is the arrangement of fans and air filters, with recommendations suggesting filters should be placed at least 1.5 times the fan diameter away for optimal airflow. Participants mention that industry practices often suggest a distance of 3 to 8 pipe diameters to ensure flow uniformity. The inquiry seeks formal standards or credible manufacturer resources to support these guidelines. Proper fan and filter separation is crucial for effective ventilation design.
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Hi,


I'm currently designing the ventillation for a number of pump stations for a large water pipeline. Essentially this will mainly involve forced air cooling, to keep the space within 5degress of ambient (i.e. no air conditioning).

My question has to with fan and and air filter arrangements. Through some brief reading I have found some 'rules of thumb' saying that the filter should be placed away from the fan at a distance of at least 1.5 x fan diameter, for uniformity of air flow through the filter.

Does anyone know any formal standards or industry guidelines that specify this. Or even websites of manufactures that look more legit. than the one's I've found
 
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I am not sure of formal standards, but often 3 to 8 pipe diameters are used to straighten the flow for something like this.
 

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