HP 8550mfp Service Manual - Page 60

Ozone safety Ozone emission The corona assemblies found in laser printers and photocopiers generate ozone gas (O3) as a by-product of the electrophotographic process. Ozone is generated only while the printer is printing (while the coronas are energized). This HP LaserJet printer contains an charcoal filter to protect office air quality. See page 119 for suggested replacement intervals. Ozone standards Standards for exposure to ozone have been established by the Department of Labor-Occupational Safety and Health Administration (DOL-OSHA) and the American Conference of Governmental Industrial Hygienists (ACGIH). These standards are 0.1 parts per million as a time-weighted average and a ceiling limit respectively. All HP LaserJet family printers meet these standards when shipped from the factory. Recommendations for minimizing ozone exposure Some people are extremely sensitive to ozone. In such cases, it is advisable to position the printer away from the sensitive user. Also, a more frequent filter replacement might be necessary. Almost all ozone concerns arise from abnormal site or operating conditions. The following conditions might generate an ozone complaint:
installation of multiple laser printers in a confined area
extremely low relative humidity
poor room ventilation
directing the exhaust port of the printer towards the face of personnel
poor conditions of the existing ozone filter
long, continuous printing combined with any of the above Inspect your work environment for the operating conditions listed above if you believe ozone emissions are a problem in your area. (Your employer is responsible for providing a work environment that is free of these conditions.) 58 Chapter 1 - Product information EN