Laser printers with corona wires generate ozone. This is because oxygen (O2) becomes electrically converted to ozone (O3) by the electrical discharges created during the printing process. Ozone is corrosive (much like bleach is corrosive), and is especially harmful to rubber parts and to people's lungs. For this reason, laser printers with corona wires are fitted with ozone filters. These can become clogged or worn out over time. It is recommended to change the ozone filters periodically, for example, every 50,000 impressions. Some laser printer drum replacements come with ozone filters, so that the filters can be changed each time the drum is changed. We recommend replacing the ozone filters on an annual basis, at the time the printer receives its annual cleaning.
Laser printers manufactured around 1988 are most likely to contain an ozone filter. Hewlett Packards popular HP II and III printers contain ozone filters.
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