Epson FX-2190 Reference Manual page 224

B. 15/16 inch (23.8 mm) min.
C. Corner radius = 0.1 inch (2.5 mm) min.
Envelopes (rear entry only):
Envelope size
(No. 6)
Envelope size
(No10)
Total thickness
Weight
Quality
Roll paper (rear entry with optional roll paper holder only):
Width
218 Product Information
Width (mm)
(inch)
Length (mm)
(inch)
Width (mm)
(inch)
Length (mm)
(inch)
(mm)
(inch)
(g/m²)
(lb)
(mm)
(inch)
Minimum
165
6.5
92
3.6
241
9.5
105
4.1
0.16
0.0063
Differences in thickness
within the printable area
must be less than 0.25 mm
(0.0098 inch).
45
12
Bond envelopes, plain
envelopes, and airmail
envelopes without glue on
the flap
Minimum
216
8.5
Maximum
0.52
0.0205
90
24
Maximum