TEST PRESSURES VERSUS CLASS (AAMA/WDMA/CSA 101/I.S.2/A440).
|
CLASS |
PRELOAD (H20) |
STP (H20)
|
WTP (H20) |
|
"R" 15 |
11.25 (2.16) |
22.50 (4.32) |
2.86 (.55) |
|
20 |
15.00 (2.88) |
30.00 (5.76) |
3.00 (.58) |
|
"LC" 25 |
18.75 (3.60) |
37.50 (7.20) |
3.75 (.72) |
|
"C" 30 |
22.50 (4.32) |
45.00 (8.64) |
4.50 (.86) |
|
35 |
26.25 (5.04) |
52.50 (10.08) |
5.25 (1.01) |
|
"HC" 40 |
30.00 (5.76) |
60.00 (11.52) |
6.00 (1.15) |
|
45 |
33.75 (6.48) |
67.50 (12.96) |
6.75 (1.30) |
|
50 |
37.50 (7.20) |
75.00 (14.40) |
7.50 (1.44) |
|
55 |
41.25 (7.92) |
82.50 (15.84) |
8.25 (1.58) |
|
60 |
45.00 (8.64) |
90.00 (17.28) |
9.00 (1.73) |
|
65 |
48.75 (9.36) |
97.50 (18.72) |
9.75 (1.87) |
|
70 |
52.50 (10.08) |
105.00 (20.16) |
10.50 (2.02) |
Mobile Home: +25.0 psf = 4.80" (H20) -12.5 psf = 2.40" (H20)
Inches of Water = psf / 5.208
NOTES:
"R" = Residential
"LC" = Light Commercial
"C" = Commercial
"HC" = Heavy Commercial
Residential Ratings begin at Class 15, Light Commercial Ratings begin at
Class 25, Commercial Ratings begin at Class 30 and Heavy Commercial ratings
begin at Class 40. These ratings are dependent upon the size of the product.
Should you want a Commercial rating, but the size of the test sample only meets
the size requirements for a Light Commercial Rating, then it would have to be
rated as an LC. In other words, if your product doesn't meet the size
requirements for a C Rating, but it passes the Water and Structural testing at
the 30 or 35 level, then it can be labeled as an LC30, or LC35, etc.
Structural Test Pressure (STP) = 1.5 X Class (Design Pressure).
Water Test Pressure (WTP) = 15% of Class (Design Pressure).
Preload = 1/2 of the Structural Test Pressure. Preloading is only
required when Permanent Set Measurements are being taken. Normally Permanent
Set Measurements are only required when there is an intermediate member such as
a meeting rail or interlock on a Horizontal Slider, Single Hung Or Sliding
Glass Door or XO configuration of any type or a horizontal or vertical mullion
of any type in a Fixed product.
The preload is applied for 10 seconds and then released. The gages are
then set to zero and the Structural Test Pressure is applied. The purpose of
the preload is to remove mechanical slack and permanent set that may have been
introduced from previous testing.
TABLE OF
EQUIVALENT WIND VELOCITIES
|
CLASS |
STRUCTURALTEST PRESSURE IN PSF |
EQUIVALENT WIND VELOCITY IN MPH |
WATER TEST PRESSURE IN PSF |
EQUIVALENT WIND VELOCITY IN MPH |
|
15 |
22.50 |
95 |
2.86 |
34 |
|
20 |
30.00 |
110 |
3.00 |
35 |
|
25 |
37.50 |
123 |
3.75 |
39 |
|
30 |
45.00 |
134 |
4.50 |
42 |
|
35 |
52.50 |
145 |
5.25 |
46 |
|
40 |
60.00 |
155 |
6.00 |
49 |
|
45 |
67.50 |
164. |
6.75 |
52 |
|
50 |
75.00 |
173 |
7.50 |
55 |
|
55 |
82.50 |
182 |
8.25 |
57 |
|
60 |
90.00 |
190 |
9.00 |
60 |
|
65 |
97.50 |
198 |
9.75 |
63 |
|
70 |
105.00 |
205 |
10.50 |
65 |
NOTE: Wind velocity has been rounded to
the nearest 1 mph
|
AIR INFILTRATION PRESSURES IN PSF |
EQUIVALENT WIND VELOCITY IN MPH |
|
1.57 |
25 |
|
6.24 |
50 |
These values are calculated
from the Ensewiler formula, P = .002496 V2, where V = Wind Velocity
in MPH and P = the Differential Pressure across the window in Pounds per Square
Foot. The equation assumes the direction of the wind is perpendicular to the
window and there are no effects from surrounding terrain or the shape of the
building in which it is installed. Positive (+) pressures act inward and
Negative (-) pressures act outward on the window.
This information
provided Courtesy of Quality Testing Incorporated. For any additional
information or questions, contact us at:
Quality Testing Inc. 3310 Hill
Avenue Everett, WA. 98201 Phone: 425-259-6799 Fax: 425-259-4936
email: qualtest@premier1.net