Brother MFC 8220 - Manual (Page 25)

PRINTER DRIVER SETTINGS 2 - 5
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When using ordinary plain paper (19 to 25 lb), select Plain
Paper. When using heavier weight paper, envelopes or
rough paper select Thick Paper or Thicker Paper. For bond
paper, select Bond Paper for OHP transparencies, select
Transparencies.
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When you use envelopes, select Envelopes. If the toner is
not fixed to the envelope correctly when Envelopes has
been selected, select Env. Thick. If the envelope is
crumpled when Envelopes has been selected, select Env.
Thin.