How do you convert Pa to cfm?

Answer 1

You can't.

Pascals (pa) area messurement of pressure. CFM (cubic feet per minute) is a rate of flow. However, there is a device called a manometer which is used to measure either pressure(in pascals) or air flow in(in cubic feet). Most commonly used for blower door tests.

Answer 2

You cannot directly convert pressure (Pa) to volumetric flow rate (cfm) as they are different units. You would need additional information such as the temperature and cross-sectional area to convert pressure to volumetric flow rate using the ideal gas law.