(a) Rooms in which Class I or II liquid is used in open vats, pans or other vessels, or in which Class I, II or III liquid is heated or otherwise treated in such a manner as to produce flammable vapor, shall be well ventilated either by ample natural ventilation or by approved mechanical exhaust ventilation adequate to prevent fire and health hazards and as approved by the Fire Chief and the Commissioner of Air Pollution Control. Ventilation shall be such that the percentage of flammable vapor present in any room or exhaust duct at any time shall not exceed one-fifth (1/5) the lower explosive limit and that toxicity will be reduced by dilution to a safe concentration. Exhaust openings shall be located at or adjoining the floor level near each open receptacle containing such liquid, or near each heated receptacle from which vapor may escape, and remote from any door or other air inlet.
(b) All discharge outlets of vent ducts shall be so located that they will neither be fire-hazardous to surrounding property nor create a nuisance.
(Ord. No. 991-49. Passed 6-27-49, eff. 6-27-49)