Envelopes should not be wrinkled, nicked, stuck together, or otherwise damaged. Do not use envelopes that have clasps, snaps, windows, coated linings, self-stick adhesives, or other synthetic materials.
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Only use envelopes where the seam extends all the way to the corner of the envelope as indicated in the following illustration.
1
Acceptable
2
Unacceptable
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Envelopes that contain a peel-off adhesive strip or more than one flap that folds over to seal must use adhesives that are compatible with the heat and pressure in the fuser.
CAUTION:
Failure to follow these guidelines can result in jams.
