What is the maximum print speed of the HP LaserJet Pro 4004 series?
The HP LaserJet Pro 4004 series prints at up to 40 ppm for black A4 in normal mode, and up to 34 ipm for duplex (two-sided) printing on A4. Print speed is measured using ISO/IEC 24734 and excludes the first set of test documents. Exact speed varies depending on system configuration, software application, driver, and document complexity. (Page 3)
From the official HP Laserjet Pro 4001 4004n DN DW D Printer manual, page 3
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