Beginning Point Of Water Penetration
MANUFACTURER
MODEL
FREE AREA %
Free Area Velocity (fpm)
Pressure Loss (in. wg.)
Drainable Louvers
POTTORFF
EFD-445
50.4
1,026
0.160
GREENHECK
ESD-403
50.0
1,007
0.175
RUSKIN
ELF445DX
52.1
1,075
0.233
POTTORFF
EFD-635
60.7
1,250
0.200
GREENHECK
ESD-635
58.8
1,250
0.232
RUSKIN
ELF6350DMP
62.2
1,250
0.206
POTTORFF
EFD-637
57.5
1,113
0.150
GREENHECK
ESD-635HP
61.5
910
0.126
RUSKIN
ELF6375DX
56.8
1,023
0.155
POTTORFF
EFJ-437-HP
56.3
912
0.140
GREENHECK
EDJ-401
52.0
963
0.152
RUSKIN
ELF375X
53.6
803
0.146
Louver Model Number Format
EFD-445
Material Type - E = Extruded Aluminum S = Steel
Operation - F = Fixed / X = Combination C = Chevron / O = Operable
Blade Type - D = Drainable V = Vertical J = J-Blade
Louver Depth - 2 = 2" Deep / 4 = 4" Deep 6 = 6" Deep / 7 = 7" Deep
Blade Angle - 45 = 45° Angle 35 = 35° Angle 37 = 37° Angle
5
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