minimum design pressure of 720 Pa (15 psf) is judged
insufficient for a double-hung (H) residential
window, the specifier may choose a window built to a
design pressure of 1436 Pa (30 psf). The symbol
would be H-R30 (instead of H-R15). The higher
performance class, in addition to including a higher
design pressure, also specifies correspondingly
higher test criteria for uniform structural load and
water resistance. Optional Performance Classes
other than those specifically listed may be
specified by setting any design pressure in
increments of 250 Pa (5 psf). When an Optional
Performance Class is specified, the following
statement should be added: "Windows shall conform
to Optional Performance Class [_____] when tested in
accordance with AAMA 101."
OPTIONAL PERFORMANCE CLASSES METRIC
*A
*B
Water
Optional
Applicable
Design
Structural
Performance
Product
Pressure
Test Pressure
Test Pressure
Class
Designation
Pa
Pa
Pa
R,C,HC
AW
__________________________________________________________________
20
R
958
1436
144
25
R
1197
1796
180
30
R,LC
1436
2155
215
35
R,LC,C
1676
2514
251
40
R,LC,C
1915
2873
287
45
R,LC,C,HC,AW
2155
3232
323
50
R,LC,C,HC,AW
2394
3591
359
55
R,LC,C,HC,AW
2633
3950
395
526.7
60
R,LC,C,HC,AW
2873
4309
430.9
574.6
65
R,LC,C,HC,AW
3112
4668
466.8
574.6
70
R,LC,C,HC,AW
3352
5027
502.7
574.6
75
R,LC,C,HC,AW
3591
5387
538.7
574.6
80
R,LC,C,HC,AW
3830
5746
576
576
85
R,LC,C,HC,AW
4070
6105
610
610
90
R,LC,C,HC,AW
4309
6464
646
646
*A.
Design pressure = Performance Class
*B.
Structural test pressures shown are for both positive and
negative loads.
OPTIONAL PERFORMANCE CLASSES ENGLISH
*A
*B
Water
Optional
Applicable
Design
Structural
Performance
Product
Pressure Test Pressure
Test Pressure
Class
Designation
lb/ft sq.
lb/ft sq.
lb/ft sq.
R,C,HC
AW
__________________________________________________________________
20
R
20.0
30.0
3.00
25
R
25.0
37.5
3.75
SECTION 08520A
Page 12
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