City is requiring a “whole-house mechanical ventilation system”

[Dustin Le]

i tried google, but know so little that I can't tell what's what. I'm setting up a basement ADU and the city is requiring a minimum 30 cfm mechanical ventilation system. Does anyone have any idea what this is, where I would locate it in my house if it existed, and what it would involve to install?

I appreciate your help!

[Bill B.]

Bathroom vent fans have 80+. Simply put one in the bathroom.