I would like to know the health hazards of prolonged exposure to the fumes of mineral seal oil in an enclosed enviroment. I would also like to know the OSHA standards for ventilation when using mineral seal oil in a test stand to test diesel fuel pumps. At present, the test stand is in a vat and the tester has to lean over the vat to check for leaks, causing them to breath the fumes. Curently there is no exhaust fan and the tester is complaining of headaches and feeling sick to the stomach. Thank you for the assistance.