Parallel or inline for most cfm

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Building a blower system with four 5.7-inch thru-flow motors rated at 122 CFM at 2 inches of orifice pressure can be optimized by using parallel configurations. In a parallel setup, the combined airflow can reach 488 CFM at the same discharge pressure, assuming the duct system is appropriately sized. The proposed design involves funneling the airflow from four motors into a 1.5-inch pipe, then into a larger 4-inch funnel that leads to a 2-inch outlet. Concerns about pipe length and portability suggest keeping the system compact while ensuring efficient airflow. Ultimately, the choice between parallel and inline configurations will significantly impact performance and efficiency.
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I'm building a blower system with 4, 5.7 inch thu-flow motors they are 122 cfm @ 2" orfice with 2 stage blower. When I build the system will they have more cfm building the system with 4 parallel motors dumping into a funnel or y piping 2 inline systems?
 
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For centrifugal pumps/blowers in parallel, the flows add at a particular pump head (discharge pressure). For example, if each blower is rated 122 scfm at 20 inwc, the combined head of four in parallel would be 488 scfm @ 20 inwc.
 
...and that assumes a duct system with twice the size.
 
Sorry this will be to build pressure out going port is 2 inch
 
Ok what I am building is a livestock blow dryer they want a little over a grand to buy it I think i can build it for half that. So its basically 4 5.7 inch thru flow motor(industrial vacuum motors reversed) necked down to a 2 inch pipe. current setups are 2 inline motors funneled to a 1.5 inch pipe that are connected to a y pipe that is 2 inch out let. I could build this but if I am going to build it I was wanting to try to improve it I was thinking 4 parellel motors funneling to 1.5 inch pipe then those 4 dumping into maybe a 4 inch funnel that goes to 2 inch. don't know if it would help or just a waste of a lot of time. also one other question will length of pipe matter much or not It has to be portable so the closer together I can keep everything the better.
 
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