This Heavy-Duty Adjustable Shelf is a vented and fixed position shelf that is ideal for use in mounting heavier equipment in most standard floor enclosures and 4-post open frame racks.
Rack Shelf 20 Deep Double Vented 2 Rms from Computer Cable Store. Supports up to 100 lbs. capacity and provides air flow to ventilate mounted equipment. package includes #12 mounting screws.