Have a customer who would like to have a vented exhaust hood over his stove and wants it piped out the back above his patio door. I understand in the code book it must not be within 10' to be a nusisanes to people. I want to take it through the roof away from being a nusisanes to anyone. My question is is there any other way of doing this without going through the roof? He's determained to have me run it out the back above the patio door. And I'm not budging. I'm I doing the right thing?

Thanks