Canon MF229dw User Manual page 40

Do not store the paper in direct sunlight, or in a place subject to high humidity, dryness, or drastic changes in temperature
or humidity.
When printing on paper that has absorbed moisture
Steam may emit from the paper output area, or water droplets may form on the back side of the operation panel or around
the paper output area. There is nothing unusual about any of these occurrences, which occur when the heat generated from
fixing toner on the paper causes moisture in the paper to evaporate (most likely to occur at low room temperatures).
LINKS
Registering a Custom Paper Size
Downloaded from ManualsPrinter.com Manuals