l For envelopes with a flap length from 25 mm to 60 mm, the minimum flap angle is 18 degrees.
l For envelopes with a flap length greater than 60 mm to the maximum flap length for the particular
model, the minimum flap angle is 21 degrees.
Acceptable envelope materials
Material type and finish must be matte and may include (if available in your market):
Running mail
Pitney Bowes Operator Guide February,2018 Page 67 of 349