AAMA 101 establishes a minimum Performance Class for
each (window) Grade: 15 for residential (R) windows
(corresponding to a design pressure of 72 kg/sq m 15
psf); 20 for commercial (C) windows (corresponding
to a design pressure of 96 kg/sq m 20 psf); and 40
for heavy commercial (HC) windows (corresponding to
a design pressure of 192 kg/sq m 40 psf).
AAMA 101 also includes criteria for specifying
windows required to meet higher design pressures if
the minimum design pressure for the particular
(window) Grade is determined to be inadequate. These
windows are designated as Optional Performance Class
windows. The Performance Class for Optional
Performance Class windows should be specified in
increments of 24 kg/sq m 5 psf above the minimum
Performance Class.
ASTM D 4099 classifies window units by Grades based
on design pressure. A Grade 15 window is
constructed to a design pressure of 72 kg/sq m 15 psf,
a Grade 20 window is constructed to a design
pressure of 96 kg/sq m 20 psf, etc. Thus, for each
window type included, specify an ASTM D 4099 Grade
level equivalent to the required AAMA 101
Performance Class.
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NOTE: Edit for window types to be included in the
project. Consult AAMA/NWDDA 101 and the AAMA
"Window Selection Guide" or the Society of the
Plastics Industry (SPI) Certified Products Directory
for definitions of each type and design
consideration. The most commonly used window types
have been listed in this specification; windows are
available in other types and can be made in various
combinations and custom fabrications. Select window
types on basis of functional requirements and
economic considerations. Functional requirements
include operation of window, weather environment,
conditions of usage and aesthetic factors. Economic
considerations include initial cost as well as
maintenance costs over life of the facility.
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NOTE: Consult AAMA 101 to calculate design
pressure(s) applicable to the project. Adjust
"design factors" because naval facilities are
typically less than 100 miles from hurricane
oceanline.
The Performance Classes listed in brackets represent
minimum design pressures to which windows meeting
AAMA 101 will be constructed. When design pressure
is determined to be less than minimum design
pressure for selected (window) Grade, specify
SECTION 08560
Page 9
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