What are the recommended operating temperature and humidity ranges for the printer?
The recommended operating temperature is 17.5° to 25°C (63.5° to 77°F), with an allowed range of 15° to 32.5°C (59° to 90.5°F). The recommended relative humidity is 30% to 70% RH, with an allowed range of 10% to 80% RH. (Page 13)
From the official HP Laserjet Pro Mfp M426 M427 F manual, page 13
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