The WMA Series wall cabinets are 16-gauge, welded with 18" deep center-section and adjustable mounting rails, and a 4 1⁄2" deep rear section. Panel space openings range from 10 RU to 35 RU. Cabinets are equipped with provisions for custom cabinet mounting, wire man­agement, equipment mounting, and structural support. All models include adjustable front rack rails tapped 10-32, and manufactured to standard E.I.A. 1⁄2" spacing. Hat channels provide adjustable rack rail support with securing holes for fixed positioning of rails. Top and Bottom removable 3RU panels are located in the center section of the cabinet for EFP Series fan panels for further ventilation or for isolation panels for power. The back face of the rear section is equipped with 1⁄4" deep boss detents which give Contractors field flexibility to install a custom plywood, aluminum, or steel sub-plate for mounting accessories inside the cabinet. Boss detents are on 12" centers. The rear section provides an interchangeable Right or Left hand cylinder lock for security. The cabinets have 16 conduit knockouts on the top of the rear section and 16 on the bottom of the rear section. Knockouts consist of two 1/2" (12.7mm) standard, three 1" (25mm) / 1 3/8" (34.9mm) concentric and four 1⁄2" (13mm) / 3⁄4" (19mm) concentric. Perforated vents, located on both sides (top and bottom) of the center section, provide ventilation for rack-mounted electronics. The cabinets offer a non-sagging design. The units' one-piece front and rear sections are strengthened with an internal alignment frame that supports the center section of the cabinet through its entire travel range. Cabinets are finished in a black electrostatic powder coat. An optional caster for carrying the weight of the center sections is available (Atlas CT31A). Features 12.5" x 12.5" Cut-Out on Back Pan Allows Easy Cable Access Through Mounting Surface Back Pan Includes Raised Mounting Embosses to Mount Power and Other Accessories Back Pan Now Boxed Separately on the Same Pallet with Center Section Allows Contractor to Send Rear Section to Job Site for Installation by Other Trades Exclusive, Integral Atlas Sound "Alignment Frame" Provides Support Throughout the Complete Center Section Extensive Internal Bracing Also Provides Cable Management/Pass Through Finished in Durable Black Electrostatic Powder Coat Mirror Image Back Pan Allows Left or Right Hinging of Center Section Regardless of Orientation Multiple Knockouts Top and Bottom of Rear Section for Conduit & Wireless Antennas New Side Lock Security System Provides an Easy Yet Secure Method of Joining Center Section to Back Pan New, Continuous Slot "Hat Action" Design Allows Full Front to Back Adjustment of Rails. Securing Holes Top and Bottom Provide Fixed Positioning of Rails. New, Secure and Innovative Design Greatly Simplifies Process of Mounting Center Section to Rear Pan - May be Safely Installed by One Person Rails Include Hash Marks to Indicate Rack Increments Ships with One Set of Plated Rack Rails and (100) 10/32 x .75" Rack Screws with Captive Washers. "Optional Rear Rack Rail Pair Model WMA-RRxx(Height Per Model) Also Available" Top and Bottom cutouts for Atlas Sound ES Series Single or Dual Fan Panels (Ships with 3RU Blank Panels Installed) UL 1678 Listed