What is the minimum vertical separation required for rooftop terminations below any roof access?

The minimum vertical separation required for rooftop terminations below any roof access is three feet. This requirement is outlined in the NFPA 96 Standard to ensure that exhaust systems do not interfere with personnel accessing the roof and to minimize the risk of fires by ensuring that discharged vapors and gases do not pose a hazard. The three-foot distance helps to ensure that fumes, grease-laden vapors, and other potentially flammable materials expelled from the venting are far enough away from areas of potential ignition or personnel activity, thereby enhancing safety during maintenance and emergency situations.