The Extron Half Rack Shelf System and related accessories is designed for applications utilizing one‑half rack width and smaller products. The compact, 1U half‑rack width size allows the mounting of half-, quarter-, and eighth‑rack products in space-constrained furniture such as lecterns and cabinets that are not wide enough to support the mounting of full width, 19" rack shelves or electronics. The Half‑Rack System is comprised of the HRB 109 Basic Rack Shelf; the HRU 109 Universal Rack Shelf Kit, which includes eighth‑rack and quarter‑rack false faceplates; and the HRP 100 Blank Panel. The HRP 104 AAP has openings for up to four single‑space AAP – Architectural Adapter Plates and is available in a black powder coat finish. Most Half‑Rack System products are finished in a durable gray powder coat finish to match other Extron products.