Hi Jokergerm:
There is a national building Code “BOCA”.
We are required, before any construction starts, to submit plans and specifications to the building department, health department and fire marshal.
We just did a job where we had to submit plans to all of the above plus submit 20 additional copies so each member of the city council could have one.
We must before construction starts specify the type of hood, submit its certification, if it has one, specifying exactly the CFM exhausted and the make up air supplied.
After installation the hood is subjected to an air balance test to determine if it is functioning properly and that the building is properly pressurized.
There are a great many more rules and regulations in the BOCA code to assure buildings are properly constructed with the safety of the public as the primary consideration
If your jurisdiction is not complying with the code I would be a bit concerned as to what other rules and building codes they are not checking and enforcing.
George Mills