How to interpret air flow charts


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Old 07-07-18, 10:38 PM
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How to interpret air flow charts

I'm looking at air flow charts for a Mitsubishi mini-split ducted/concealed indoor unit. Specifically SEZ-KD18NA4. I totally get how an individual charts shows CFM vs external static pressure for each of the 3 fan speeds. What I'm not understanding at all is why there are 4 charts. Each chart is labeled with a different external static pressure, but that's also varied on the vertical axis. Does anyone know what the 4 charts represent or what I'm missing? (Their other ducted units have similar multiple-charts.)
 
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Old 07-08-18, 05:48 AM
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Ezee question!

Static pressure increases in proportion to airflow.
More airflow = higher static pressure.
 
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Old 07-08-18, 11:10 AM
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Thanks for the tip, I had not understood that each of the charts corresponds to a design point / rated point.
 
 

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