Wind Driven Rain 29 MPH Wind & 3 in./hr. Rain
Beginning Point Of Water Penetration
FREE AREA %
MANUFACTURER MODEL
Free Area Velocity (fpm)
Pressure Loss (in. wg.)
Core Area Velocity (fpm)
Class
Wind-Driven Rain
POTTORFF
ECD-545
46.3
1,250
0.240
A
862
GREENHECK EHH-501
42.5
1,250
0.224
A
776
RUSKIN
EME520DD 47.4
1,250
0.244
A
673
Beginning Point Of Water Penetration Max Section Size W x H (in.)
FREE AREA %
MANUFACTURER MODEL
Wind Load (psf)
Free Area Velocity (fpm)
Pressure Loss (in. wg.)
FEMA Grille
POTTORFF
XAV-545
51.2
680
0.170
48 × 96
300
GREENHECK AFL-501
47.5
553
0.080
60 × 120
250
48 × 78
300
RUSKIN
XP500
49.8
615
0.122
48 × 90
230
48 × 96
200
Beginning Point Of Water Penetration
MANUFACTURER MODEL FREE AREA %
Free Area Velocity (fpm)
Pressure Loss (in. wg.)
Combination Blade
POTTORFF
EXA-645
50.4
1,085
0.110
GREENHECK EACA-601
48.0
1,221
0.170
RUSKIN
ELC6375DAX
46.8
1,169
0.193
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