What is the print speed of the HP LaserJet Pro MFP M428/M429?
The M428-M429 models print at up to 38 pages per minute (ppm) on A4 paper and 40 ppm on Letter-size paper. The M329 model prints at 35 ppm on A4 and 37 ppm on Letter-size paper. (Page 6)
From the official HP Laserjet Pro Mfp M428 M429 F manual, page 6
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