HP Color LaserJet 8550 Multifunction Printer series - Manual (Page 213)

212 B Specifications EN
Operating Environmental Specifications
Temperature
z Recommended
z Allowed
68 to 79 ° F (20 to 26 ° C)
59 to 86 ° F (15 to 30 ° C)
Humidity
z Recommended
z Allowed
20 to 50% RH
10 to 80% RH
Altitude
Allowed
0 to 10,000 ft (0 to 3,048 m)