Canon Laser Shot LBP5970 User Manual page 111

When loading envelopes at a size of DL, COM10, C5, or Monarch, load them so that the
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flap is toward the right of the printer when viewed from the front.
3
When printing envelopes of the Envelope B5 size, close the flaps and load them so that
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the envelopes are printed from the top (the edge with the flap).
Printing speed drops when printing envelops.
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NOTE
When printing envelopes, they may be creased.
3-6 Paper Requirements