2.1.5
Glass
Fully tempered, clear float glass, [3] [_____] mm [1/8] [_____] inch thick.
2.2
DOORS
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NOTE: The normal design wind load for vertical lift
metal doors is one kPa 20 psf. If conditions
require greater design loads, use appropriate loads.
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Doors shall consist of multiple sections set one behind the other. Arrange
door operation and travel so that sections arrive simultaneously at the
full open position. Sections shall stack vertically in a compact group
above the head of the opening. Provide doors with counterweights. Doors,
components, and methods of installation shall be designed in accordance
with AISC 335. Minimum design wind load shall be [one kPa] [20 psf] [as
indicated for the building] [[_____] kPa psf]. Maximum wind load
deflection of the door shall not exceed the door height in mm inches
divided by 120 and the door width in mm inches divided by 120. Doors
shall be operable during design wind load.
2.3
MANUAL OPERATORS
Provide a galvanized, endless chain operating over a sprocket. Extend
chain to within 900 mm 3 feet of the floor and mount on inside of building.
Obtain reduction by use of roller chain and sprocket drive or gearing.
Provide chain cleat and pin for securing operator chain. Hoist shall allow
for future installation of electric operators. The force required to
operate the door shall not exceed 15.75 kilograms 35 pounds.
2.4
ELECTRIC OPERATORS
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NOTE: Specify three-phase motors wherever
three-phase electrical service is or will be
available. Locate control stations so operator will
have complete visibility of the door at all times,
within building at least 1500 mm 5 feet above floor
line; one station should be placed about 600 mm 2
feet from jamb, guide, or track.
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Provide operators of the type recommended by the door manufacturer.
Operators shall include electric motor, machine-cut reduction gears, steel
chain and sprockets, magnetic brake, brackets, pushbutton controls, limit
switches, magnetic reversing contactor, a manual operator as specified
above for emergency use, and other accessories necessary for operation. The
electric operator shall be designed so that the motor may be removed
without disturbing the limit switch timing and without affecting the manual
operator. The manual operator shall be clutch controlled so that it may be
engaged and disengaged from the floor; operation shall not affect limit
switch timing. Provide an electrical or mechanical device that disconnects
the motor from the operating mechanism when the manual operator is engaged.
2.4.1
Motors
NEMA MG 1, high-starting torque, reversible type with sufficient horsepower
SECTION 08370
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