Deep freezer is just a term for a style of freezer, in that's
it's generally dedcated as a freezer without a refrigerator
section. It may also be called `deep' because the freezer box is
usually deep so that it can hold quite a bit of product.
Most deep freezers tend to have the opening in the top and can
be a few feet wide and
usually a bit longer, and around 2 1/2 to 3' deep. Of course,
there's varoius makes and models from which to choose.