Middle Atlantic MRK-4431PROLRD Data Sheet

MRK Series

19” gangable enclosure

• Fully welded construction provides the following weight
capacities: UL Listed load capacity: 2,500 lbs., Static load
capacity: 10,000 lbs., seismic certified capacity - 1,050 lbs.

• 1/8” thick structural steel internal braces

• 22” OD width with multiple depths available

• 1/2”, 3/4”, 1” & 1-1/2” electrical knockouts on split

features:

rear plates top & bottom, easily removable for cable
pass-through, top plates additionally include UHF/VHF
knockouts

• Two wide pairs of 11-gauge, 10-32 threaded rackrail
with numbered rackspace increments

• Optional solid, fully vented, plexi and vented plexi front
doors available

• Open top with configurable top panel options

• Durable black textured powder coat finish

• Seismic certified (when used with MRK-Z4 option) with
an Ip value of 1.5

• UL Listed in the US and Canada

narrow design for large multi-bay jobs

MRK-4426

EIA compliant 19” gangable equipment rack shall be Middle Atlantic Products model # MRK-_ _ (refer
to chart). Overall dimensions shall be __”H x 22”W x __”D ( refer to chart) . Useable height shall be _ _
rackspaces, useable depth shall be _ _” (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 char t). 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

specifications:

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 GREENGUA RD 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.

Customizable specification clips available at middleatlantic.com

EIA/TIA COMPLIANT

SEISMIC CERTIFIED

options:

• Front doors shall be reinforced steel, model # FD-x (solid),
VFD-x (vented, 25% open area), LVFD-x (vented, 64% open area),
PFD-x (plexi), PVFD-44 (vented plexi) (x = # of rackspaces)

• Vented steel rear doors shall be model # MW-VRD-44 (vented top
and bottom), MW-LVRD-x (vented, 64% open area, excludes 24
and 37 space rack) (x = # of rackspaces), MW-CLVRD-44 (split
rear door, vented, 79% open area)

• Removable keylocked side panels shall be model # SPN-x­ (267/312/36/423) (x = # of rackspaces), 267 = 26-1/2” cabinet
depth, 312 = 31-1/2” cabinet depth, 36 = 36” cabinet depth,
423 = 42” cabinet depth

• Top panels shall be 16-gauge steel, multiple styles available including
model # MW-ST (solid), MW-10FT (10” fan), MW-4FT (four 4-1/2”
fans), MW-6FT (three 6” fans), MW-VT (vented), MW-LA (accepts 6”
and 12” wide cable ladders) and MV-PVT (26/31/36/42) (Vented
pagoda adds 1.41” to top of rack)

• Caster base shall add 1” to overall height, featuring four casters with
a 1,300 lb. weight capacity, UL Listed in the US and Canada. Model
# CBS-MRK-x (x = cabinet depth)

• Fine floor friendly caster base shall have a 700 lb. weight capacity.
Model # CBS-MRK-xR (x = cabinet depth)

• Rail bracket adapters shall allow for mounting of panels vertically
between rackrail brackets. Available for 44 space enclosures. Model
# RBA-MV44-2, 2 rackspaces.

• Seismic Zone-4 and Seismic Use Group III compliancy floor anchor
kit shall be model # MRK-Z4

• Slide-out AXS enclosure option available (See AXS Spec sheet #
96-055S)

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96-039 / rev k / 2-11-16

MRK Series

configured a/v enclosure

• Integrated fan top with proportional speed fan controller

• Configurable rear door with bottom vent, solid locking front door

• 3-1/4” wide, 44 space vertical lacer strip

• Six horizontal lacer bars

®

• Twelve 8” Velcro

includes:

• Thin power strip, 20 Amp, 20 outlet with cord

• Leveling feet

• 100 qty. 10-32 mounting hardware

• Available with or without sides

• Ganging hardware available for add-a-bay models without sides

cable management straps

configured A/V enclosure ships complete with
the most commonly used accessories

26-1/2” or

31-1/2”

MRK-4426-AV-AB

EIA compliant 19” gangable equipment rack shall be Middle Atlantic Products model # MRK- __-AV (refer to chart). Overall dimensions
of rack shall be 83-1/8” H x __” W x __” D (refer to chart). Useable height shall be 44 rackspaces, useable depth shall be _ _” (refer
to chart). Fully welded construction shall provide 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, solid front
door shall be 18-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. Rack shall include 100 qty. 10-32 mounting screws. Rack shall be equipped with
one vertical lacer strip, Middle Atlantic Products model # L ACE-44-OP. The LACE-44-OP is 3-1/4” wide and the useable height is 44
rackspaces. Rack shall also include four ‘L’ shaped straight and two 4” offset horizontal lacer bars and twelve, 8” Velcro® straps for cable
management. Models intended for ganging (MRK-__-AV-AB ) (refer to chart) shall include ganging hardware for multi-bay installations.
Rack shall feature integrated fan top, Middle Atlantic Products model # MW-10FT-FC for active thermal management. MW-10FT-FC shall
feature proportional speed fan control and maximum airflow shall be 550 CFM. 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 ;

specifications:

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 include a high-density thin power distribution and shall be Middle Atlantic Products model # PDT-2020C-NS with 20
outlets and 20 amps. Thin power distribution shall be 72-3/4” long x 1” deep x 1.9” wide. JBox shall be 2” deep x 2” wide. Thin power
distribution shall feature 20 NEMA 5-20R outlets. Corded power strip includes 20-amp protection and mounting hardware. Corded model
shall be terminated with 10 foot power cord and NEMA 5-20P plug. PDT Series shall feature a black anodized finish. MRK and PDT Series
shall be UL Listed in the US and Canada. MRK-_ _-AV shall be GREENGUARD Gold Certified. MRK-__-AV shall be RoHS EU Directive
2002 /95/ EC compliant. MRK-__-AV shall be manufactured by an ISO 9001 and ISO 14001 registered company. PDT-2020C-NS and
MW-10FT-FC shall be warrantied to be free from defects in material or workmanship under normal use and conditions for a period of 3
years. 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.

Customizable specification clips available at middleatlantic.com

EIA/TIA COMPLIANT

SEISMIC CERTIFIED

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