Parallel fans in same ducting system

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Running two parallel fans in the same ducting system does not simply result in a total airflow of 14,000 cmh; the actual increase in flow depends on the pressure dynamics within the system. If both fans are operated simultaneously, the flow may increase to around 1.4 times the capacity due to pressure changes, rather than doubling. The performance of each fan is influenced by its characteristic curve, which can vary significantly. Additionally, questions arise about managing airflow to prevent the duty fan's output from entering the standby fan. Understanding these dynamics is crucial for effective system design.
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Currently, I have a mv fan ducted system with two fans in parallel, one duty and standby (each with 7000cmh).
If I were to run both fans at the same time, do I get 14000cmh in total?
 
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KingMan said:
If I were to run both fans at the same time, do I get 14000cmh in total?
No. You must study the flow versus pressure relationship first.
The two fans will only double the flow if there is no increase in pressure when the two fans are operated together.
 
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...if there is an increase in pressure due to having a fixed/the same ducting system the flow increase may be somewhere near 1.4x. I say "may be somewhere near" because fan performance follows a characteristic curve that is different for every fan, and may stray from the ideal.
 
Welcome!
What "mv" stands for?
How do you keep the airflow produced by the duty fan from going through the standby fan?
 
MV = Mechanical Ventilation.
 
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