Middle Atlantic ERK Series Rack, 18 RU, 20in Depth

Middle Atlantic

Herman # MIDERK1820

MFR # ERK-1820


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House your equipment with the Middle Atlantic ERK 19 x 18.5 x 31.5" 18SP Rack with Rear Doors. This rack securely and attractively holds your expensive equipment with fully welded construction and 16-gauge solid steel.

A cable management system lets you keep your workplace sleek and organized while a fully adjustable pair of front rackrails gives you the versatility your projects demand.

Middle Atlantic really knows how best to hold your equipment and provide you the security you trust and the features you want.

Totally Stable

  • Fully welded construction provides 2500 lb weight capacity and when used in conjunction with the ERK-Z4 brackets the ERK is even seismic certified for up to 650 lbs of essential equipment.

Cable Management

  • Protect your equipment cables with Middle Atlantic's electrical knockouts and large cable entry on the bottom security and safety.


  • Get the ventilation you need with vented rear doors, fan guard and optional fan for increased air flow and front door options that can provide even more ventilation if desired.


  • This rack is built to last and withstand a lot of abuse. It is built with solid sides made of 16 gauge steel and features fully welded construction.

UL Listed

  • If you're in the United States or Canada then you'll be happy to know that this item is UL Listed.

Bottom Stud

  • The bottom of this unit comes with a grounding and bonding stud already installed.

Adjustable Rackrail

  • This stand-alone enclosure has a pair of fully adjustable front rackrails.


Finish Type: Textured Black Powder Coat
UL Standards Tested: UL1678
Rackrail Type: Oct-32
Seismic Load Capacity: 600
UL Load Capacity: 2500
Material: Steel
Mounting: Horizontal
Seismic Certified: Yes
ASCE: 10-Jul
RoHS: Yes
Greenguard: Yes
UL Listing No: E173107
Usable Depth: 18.47"
Usable Height: 31.625"
Capacity Weight (US): 10000
Depth: 20"
Height: 35.625"
Width: 22"
Primary Package Weight (US): 92.15
Rack Units: 18
Note: EIA compliant 19” stand-alone / gangable equipment rack shall be Middle Atlantic Products model # ERK-1820. Overall dimensions of rack shall be 35-5/8”H x 22”W x 20”D. Useable height shall be 18 rackspaces, useable depth shall be 18.47”. Rack shall be of fully welded construction. Weight capacity shall be 2,500 lbs. Rack shall be constructed of the following materials: top and bottom shall be 16-gauge steel, horizontal braces shall be 16-gauge steel welded to integral structural side panels of 16-gauge steel giving an 1/8” thick structure, all structural elements shall be finished in a durable black powder coat. Rack shall include a vented, locking and latching rear door. Rack shall come equipped with one pair of fully adjustable 11-gauge steel rackrail with tapped 10-32 mounting holes in universal EIA spacing, black e-coat finish and numbered rackspaces. Rack shall include solid locking rear door standard and solid side panels with vertical slotted vent pattern at top and bottom. Top and bottom of rack shall feature vertical slotted vent pattern. Rack shall have removable split rear knockout panels with 1/2”, 3/4”, 1”, and 1-1/2” electrical knockouts installed in base and a removable rear knockout panel with 1/2”, 3/4”, 1”, and 1-1/2” electrical knockouts and BNC knockouts for UHF/VHF antennae installed in top. Grounding and bonding stud shall be 1/4-20 threaded, installed in base of enclosure. ERK Series enclosures shall satisfy the 2007 & 2010 CBC; 2006, 2009 & 2012 IBC; ASCE 7-05 (2005 Edition) & ASCE 7-10 (2010 Edition) and the 2006 & 2009 editions of NFPA 5000 for use in areas of high seismicity, Seismic Use Group III, Zone 4 or Seismic Design Category (SDC) “D” with lateral force requirements for protecting 600 lbs. of essential equipment in locations with the highest level of seismicity and top floor or rooftop installations with an Importance factor (Ip) of 1.5 when used with ERK-Z4 seismic floor anchor bracket. Rack shall be UL Listed in the US and Canada. Rack shall be GREENGUARD Indoor Air Quality Certified for Children and Schools. Rack shall be RoHS EU Directive 2002/95/EC compliant. Rack shall be manufactured by an ISO 9001 and ISO 14001 registered company.
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