User`s guide

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Use thin, high quality envelopes for best results. Envelopes do
not feed or image as well as other materials because of folding
and multiple layers of paper. Envelope manufacturers vary in
the consistency and accuracy of the fold placement of their
envelopes. Select envelopes high in quality and consistency.
Do not use envelopes that have:
Worn edges
Irregular shapes, curls, or creases
Shiny or highly textured surfaces
Folds that are not sharply creased
Embossed printing
Been previously printed by a laser printer
Clasps
Sizes Only use envelopes within the following sizes:
Minimum: 3.82 by 7.43 inches (93 by 190.5 millimeters)
Maximum: 6.28 by 9.5 inches (161 by 241.3 millimeters)
Paper Facts E-9