By the charts and many videos also I have 2 NF-P12. I would say that the NF-P12 = AP-14. There is a slightly difference between the 2 like NF-12 runs at 1300 RPM and the AP-14 at 1450 RPM.
Interesting, when you say NF-P12 = AP-14
You means in-terms to CFM/noise ratio?
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