The DataPro 80-3423 Vented Full-Size
Rack Shelf fits an industry standard
19 inch wide rack, and is designed for
use on a center-weight rack.
Conforming to EIA-310C standards,
these shelves are made of a
medium-weight metal in a flat black
finish. This particular model features
grilled vents on the bottom for improved
airflow to heat-sensitive devices, and because
they look pretty sweet. The vented surface also
improves aerodynamics while reducing weight, in case
you're building a flying computer or other awesome contraption.
The dimensions are 19W x 19D. This is
a center-weight shelf, meaning that
it mounts with its weight approximately
balanced between front and back. It is
designed for center-weight racks, not for
front-loading racks found on many server/cluster setups.