What are the recommended media sizes when using the ADF?
For single-sided scanning, use legal-size paper up to 8.5 by 14 inches. For double-sided scan, A4 or letter size media (min: 5x5inches; max: 8.5x12 inches) are recommended (Page 10)
From the official HP Scanjet 5590 Digital Flatbed Scanner manual, page 10
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