How far should I stay from the HP DeskJet 3720 antenna during normal operation due to radio frequency exposure?
To avoid exceeding FCC radio frequency exposure limits, human proximity to the antenna should not be less than 20 cm (8 inches) during normal operation. The same 20 cm minimum distance applies under Industry Canada radio frequency exposure guidelines.
From the official HP Deskjet 3720 All-in-One Printer manual, page 10
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