Falcon 2 Pro - exhaust fan CFM?

I was curious if anybody knew the CFM of this fan? I would like to replace it with 120 mm more quiet version.

Better remove or leave and disconnect the fan and install a real fan just further up the hose.
For example this one.

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I ended up sticking with the stock fan. It’s working great out in my garage to exaust smoke/fumes outside. Thanks for the suggestion.