periphery of the door frame. The materials at the contact area shall be
compatible and corrosion resistant. The contact force for the door EM seal
shall be provided by electromagnets. When the electromagnet is energized,
the door leaf shall be pulled in to ensure a solid and continuous contact
with the door frame. When the electromagnet is de-energized, the door leaf
shall be free to swing. The EM shielded doors may use electromagnets or a
combination of permanent magnets and electromagnets.
2.5.5
Sliding Type Door
A sliding shielded door shall be of the size and operating direction
indicated. Clear openings indicated on the drawings shall not require
dismantling of any part of the door. The door shall be manually operable
from either side, inside or outside, with a maximum pull (force) of 155 N
35 pounds to set the shielded door in motion. Shielded door face panels
and frames shall be constructed of reinforced steel suitable for achieving
the specified attenuation. Frames shall be constructed of steel shapes
welded together to form a true rectangular opening. In the sealed
position, the shielded doors shall provide the minimum shielding
effectiveness specified without any derating. The doors shall be designed
for long life and reliability and shall not use EM gaskets, EM finger
stocks, or other sealing devices other than the specified direct
metal-to-metal contact. A label shall be attached to sliding doors warning
against painting of the mating surfaces.
2.5.6
Power Operators
Power operators shall be [pneumatic] [electric] type conforming to NFPA 80
and the requirements specified. Readily adjustable limit switches shall be
provided to automatically stop the door in its full open or closed
position. All operating devices shall be suitable for the hazardous class,
division, and group defined in NFPA 70.
2.5.6.1
Pneumatic Operators
**************************************************************************
NOTE: Designer will coordinate with the drawings to
ensure compressed air is available at door locations.
**************************************************************************
Pneumatic operators shall be heavy-duty industrial type designed to operate
the door at not less than 0.2 m/s 2/3 fps or more than 0.3 m/s 1 fps with
air pressure of [_____] kPa psi. A pressure regulator shall be provided if
the operator is not compatible with available air pressure. Dryer, filter,
and filter alarm shall be provided. Pneumatic piping shall be provided up
to the connection with building compressed air, but not more than 6 m 20
feet from door jambs. Operators shall have provisions for immediate
emergency manual operation of the door in case of failure. The operator
shall open, close, start, and stop the door smoothly. Control shall be
[electrical, conforming to NEMA ICS 2 and NEMA ICS 6; enclosures shall be
Type 12 (industrial use), Type 7 or 9 in hazardous locations, or as
otherwise indicated] [pneumatic] [with] [pushbutton wall switches] [ceiling
pull switches] [rollover floor treadle] [as indicated].
2.5.6.2
Electric Operators
Electric operators shall be heavy-duty industrial type designed to operate
the door at not less than 0.2 m/s 2/3 fps or more than 0.3 m/s 1 fps.
Electrical controls shall be [pushbutton wall switches] [ceiling pull
SECTION 13095A
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