Section 7607 Of Part 5. Ships And Vessels From California Labor Code >> Division 5. >> Part 5.

. Internal combustion engine-driven equipment shall be operated inside of buildings or enclosed structures only when such operation does not result in harmful exposure to concentration of dangerous gases or fumes in excess of maximum acceptable concentrations. Exhaust pipes shall be installed in such a manner that the exhaust products shall be discharged so as not to be a hazard to the operators.