MRK Series Rack, 44 RU, 42"D, Cage Nut w/o Rear Door
42" D X 83-1/8” H
Without Rear Door
Cage Nut Rackrail
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General Info
Gangable: Yes
Finish: Black Powder Coat
UL Standards Tested: UL1678
Listing Agencies/Third Party Certifications
ASCE: 7-10
RoHS: No
Greenguard: Yes
UL Listing No: E173107
Usable Depth: 39.6
Usable Height: 77.125
Panel Width: 19
Capacity Weight (US): 10000
Depth (US): 42
Height (US): 83.125
Width (US): 22
Rack Units: 44
Technical Information
Rackrail Type: Cage Nut
Seismic Load Capacity: 1050
Static Load Capacity: 10000
UL Load Capacity: 2500
Material: Steel
Mounting: Horizontal

EIA compliant 19” gangable equipment rack shall be Middle Atlantic Products model # MRK-4442PRO (refer
to chart). Overall dimensions shall be 83.125”H x 22”W x 42”D (refer to chart). Useable height shall be 77.125
rackspaces, useable depth shall be 39.6” (refer to chart). Fully welded construction shall provide a static
capacity of 10,000 lbs. and a UL Listed load capacity of 2,500 lbs. Rack shall be constructed of the
following materials: top and bottom shall be 14-gauge steel, horizontal braces shall be 16-gauge steel
and all structural elements shall be finished in a durable black powder coat. Rack shall include a locking,
latching rear door. Rack shall come equipped with two pairs of 11-gauge steel rackrail with tapped 10-32
mounting holes in universal EIA spacing, black e-coat finish and numbered rackspaces (select models
also available with cage nut style rackrail, refer to chart). Rack shall have removable split rear knockout
panels with 1/2”, 3/4”, 1” and 1-1/2” electrical knockouts and top BNC knockouts for UHF/VHF antennae.
Grounding and bonding stud shall be 1/4-20 threaded, installed in base of enclosure. MRK 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 1,050 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 MRK-Z4 seismic floor anchor
bracket. Rack shall be OSHPD approved for fixed equipment anchorage in California healthcare facilities.
Rack shall be UL Listed in the US and Canada. MRK shall be GREENGUARD Gold certified. MRK enclosure
shall comply with the requirements of RoHS EU Directive 2002 / 95 / EC. MRK shall be manufactured by an
ISO 9001 and ISO 14001 registered company. MRK enclosure shall be warrantied to be free from defects
in material or workmanship under normal use and conditions for the lifetime of the rack.