NEC SILENTWRITER SUPERSCRIPT 660 User Manual page 312

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OZONE EMISSION
Laser printers and photocopiers generate ozone gas (O3) as a by-product of
the electrophotographic process. Ozone is only generated while the printer
is printing.
UL Standards for Ozone
The only existing standard for ozone emissions has been established by
Underwriters Laboratory (UL). All Silentwriter SuperScript 660 family
printers meet this standard when shipped from the factory to our customers.

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