What is the proper clearance space needed for the treadmill?

Place the treadmill on a level surface with at least 8 ft. (2.4 m) of clearance behind it and 2 ft. (0.6 m) on each side. Do not place the treadmill on any surface that blocks air openings. To protect the floor or carpet from damage, place a mat under the treadmill.

From the official NordicTrack T Series Treadmill manual, page 3

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