This publication provides introductory technical guidance for mechanical engineers, electrical engineers and other professional engineers, construction managers and plant operators interested in managing noise generated by mechanical and electrical equipment. Here is what is discussed: 1. INTRODUCTION, 2. SOUND PRESSURE AND SOUND POWER LEVEL DATA, 3. PACKAGED CHILLERS WITH RECIPROCATING COMPRESSORS, 4. PACKAGED CHILLERS WITH ROTARY-SCREW COMPRESSORS, 5. PACKAGED CHILLERS WITH CENTRIFUGAL COMPRESSORS, 6. BUILT-UP REFRIGERATION MACHINES, 7. ABSORPTION MACHINES, 8. BOILERS, 9. STEAM VALVES, 10. COOLING TOWERS AND EVAPORATIVE CONDENSERS, 11. PUMPS, 12. FANS, 13. AIR COMPRESSORS, 14. RECIPROCATING ENGINES, 15. GAS TURBINE ENGINES, 16. ELECTRIC MOTORS, 17. STEAM TURBINES, 18. GEARS, 19. GENERATORS, 20. TRANSFORMERS, 21. OPENING IN A WALL, 22. GLOSSARY.