2.3.7.1
Construction
Ventilators shall have one or more stabilizing arms attached to the frame
when ventilator is opened from top. When ventilator is in the tilt-open
position, stabilizing arms shall provide positive positioning of the
ventilator.
2.3.7.2
Hardware
Equip each ventilator with one handle to provide both tilt and swing
operation. The tilt or swing operation shall be individually selected and
rendered operable starting only from the closed sash position. Provide a
secondary locking device for each ventilator to prevent accidental swing
operation.
2.3.7.3
Performance Requirements
Dual action windows shall meet the primary performance requirements
specified in AAMA 101 for Grade and Performance Class [R 15] [C 20] [HC 40]
[[_____] (Optional Performance Class)] or the performance requirements
specified in ASTM D 4099 for Grade [_____].
2.4
FABRICATION
Conform to AAMA 101 or ASTM D 4099 and to the requirements specified herein.
2.4.1
Subframes, Mullions and Transom Bars
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NOTE: Edit and include this paragraph when PVC
subframes, mullions and/or transom bars are
included, otherwise delete. Specify the design
pressure used to specify the Performance Class or
the Optional Performance Class for the adjoining
windows. Avoid mullion covers in cold climate
installations.
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Provide subframes, transom bars and mullions between multiple window units
which meet the design pressure of [72] [96] [192] [_____] kilograms per
square meter (kg/sq m) [15] [20] [40] [_____] pounds per square foot (psf).
Fabricate mullions and transom bars in such a manner as to permit
expansion and contraction between adjoining construction and window units
and to form a weathertight joint. [Provide mullion covers on the interior
and exterior to completely close exposed joints and recesses between window
units and to present a neat appearance.] [Provide special covers over
structural support at mullions as indicated.] [Where window cleaner
anchors are required, reinforce mullions to provide safe and adequate
support.]
2.4.2
Combination Windows
Windows provided in combination shall be the same grade and performance
class and shall be factory assembled. Where factory assembly of individual
windows into larger units is limited by transportation considerations,
prefabricate, match mark, transport, and field assemble.
SECTION 08560
Page 11
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