Flooring; Acoustic Noise - Hitachi GR2000 Series Installation Manual

An ordinary office is acceptable for installation of the router; however, if the room
where the router is to be installed is to be newly built, flooring with the following
qualities is recommended. It is important not to have exposed metal in contact with
flooring for safety reasons.
Insulation resistance: Use materials where the floor surface and ground
resistance is 1 x 105–108 W cm. This is recommended for error and electric
shock protection against static electricity. This condition is easily satisfied by
setting up a conductive circuit.
Oil resistance: Oil is used for router maintenance.
Fire resistance
Dust free
5.1.7

Acoustic Noise

1. Each model of GR2000 contains one or more cooling fans that generate noise.
Several measurements at 1 meter from the vertical edge of the device show the
following figures:
GR2000-2S: approximately 49 dB (A)
GR2000-4S: approximately 46dB (A)