Ohio Mechanical Code
501.2 Exhaust discharge. The air removed by every mechanical exhaust system shall be discharged outdoors at a point where it will not cause a nuisance and not less than the distances specified in Section 501.2.1 . The air shall be discharged to a location from which it cannot again be readily drawn in by a ventilating system. Air shall not be exhausted into an attic or crawl space.
Exceptions:
1. Whole-house ventilation-type attic fans shall be permitted to discharge into the attic space of dwelling unit shaving private attics.
2. Commercial cooking recirculating systems.
