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Pottorff > Louvers and Penthouses > Louvers and Penthouses > Non-Drainable > EFJ-437

Model EFJ-437

Extruded Aluminum Louver
4" Deep - 37-1/2 Degree J-Blade

The EFJ-437 extruded aluminum louver is designed for intake and exhaust application where protection against water infiltration is not critical. The EFJ-437 is well suited for special shape applications and is available with hidden mullions for a continuous blade appearance of multiple section assemblies. The EFJ-437 is available in a wide array of anodized and painted finishes including custom color matching.

EFJ-437 4" Deep - 37-1/2 Degree J-Blade

Standard Construction

Material: Mill finish 6063-T5 extruded aluminum.

Frames: 4" deep x 0.081" thick (102 x 2) channel.

Blades: 37-1/2o x 0.081" (2) thick J-style.

Screen: 1/2" x 0.063" (12.7 x 1.6) expanded and flattened aluminum.

Minimum Size: 4.5" x 8" (114 x 216)

Maximum Size:
Single Section: 60" x 120" (1524 x 3048) or 120" x 60" (3048 x 1524)
Multiple Section: Unlimited


Free Area: 8.9 ft2 (0.82 m2)


Performance @ Beginning Point of Water Penetration

Free Area Velocity: 772 fpm (3.92 m/s)

Air Volume Delivered: 6853 cfm (3.23 m3/s)

Pressure Loss: 0.09 in. wg. (23 Pa)


Velocity @ 0.15 in. wg. Pressure Loss: 991 fpm (5.03 m/s)

Design Load: 30 psf

AMCA Certified for Water Penetration and Air Performance

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