The shelf is a partially vented mounting solution for most deep equipment. This shelf has a front to rear mounting adjustment range from 23-1/2 to 32 in. The Middle Atlantic Deep Video Rack Shelf VDS is a fully vented mounting shelf designed for virtually any video component. It has been constructed with deep and heavy equipment in mind and features a front-to-rear, mounting, adjustment range of 23-1/2inch to 32in. It will hold up to 350 lb. of equipment and is equipped with rear, telescope, rail mounts.