I am a home remodeling contractor and I am builder a screened porch which will include having the exhaust of the home owner's fireplace located right in the middle of the screened porch. The local Charlotte, NC Mecklenburg County inspector is requesting data pertaining to what is allowed as far as venting while a screened porch is built around it. Can someone in your organization please call me? My name is Ben, owner of Ben's Home Improvements (704) 308-0156