Radioisotope fumehood. The unit requires a charcoal trap filter, lead-lined or HEPA filter as required by codes and use criteria in the exhaust stack, not part of this hood. Other characteristics are that it be strong enough to support lead shielding bricks, have at least two duplex receptacles and a cup sink. The minimum average face velocity shall be 100 fpm and the static pressure loss through the hood shall not exceed 0.2 inches of water at 100 fpm face velocity (700 CFM).