Brother MFC 7860DW - Manual (Page 146)

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Document Size
D
Document Size
(Single-sided) ADF Width: 5.8 to 8.5 in. (147.3 to 215.9 mm)
ADF Length: 5.8 to 14 in. (147.3 to 355.6 mm)
Scanner Glass
Width: Max. 8.5 in. (215.9 mm)
Scanner Glass
Length: Max. 11.7 in. (297 mm)