Comair Rotron WT12B3 19031101A

The holes in the mounting brackets are spaced at 1 U (1.75 in. or 4.45 cm), so the router can be mounted in any rack that provides holes spaced at that distance.

there are several different types of bearings, including ball and roller bearings, linear bearings, as well as mounted versions that may use either rolling element bearings or plain bearings.

the movement of air

the force per unit area that is exerted by a fluid upon a surface at rest relative to the fluid.