What is the maximum print speed of the HP LaserJet Pro MFP M28-M31?
The printer can print up to 18 pages per minute (ppm) on A4 paper and 19 ppm on Letter-size paper for some models. Other models in the series can print up to 20 ppm on A4 paper and 21 ppm on Letter-size paper. (Page 6)
From the official HP Laserjet Pro Mfp M28 M31 Printer manual, page 6
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