Rep Login (817) 509-2300
blue background, a set of control and backdraft dampers standing out
white paper
Pottorff > Louvers and Penthouses > Louvers and Architectural > Hurricane Rated > EXA-645-MD

Model EXA-645-MD

Extruded Aluminum Louver
6" Deep - 37.5-45 Degree Combination Blade

The EXA-645-MD is engineered and tested to withstand extreme loads, debris impact, and cyclic fatigue failure associated with the severe weather effects of hurricanes (Miami-Dade County approval #21-1122.05). When closed, the EXA-645-MD also protects against high-velocity wind-driven rain per AMCA 550. The design features stationary drainable louver blades to protect against water penetration and an integral airfoil blade control damper to allow positive shut-off of air intake and exhaust openings. The EXA-645-MD is available in a wide array of painted finishes including custom color matching, and may be ordered with a variety of factory mounted electric or pneumatic actuators.

EXA-645-MD 6" Deep - 37.5-45 Degree Combination Blade

Standard Construction

Material: Mill finish extruded aluminum.

Frames: 6" deep x 0.125" thick (152 x 3) channel.

37.5o x 0.081" (2) thick drainable style.
Back: 45o x 0.162" (4) thick operable airfoil style.

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

Axles: 1/2" (13) diameter steel hex.

Linkage: Concealed in frame.

Low Leakage Seals: TPV blade edge and flexible metal jamb.

Bearings: Synthetic.

Minimum Size: 12" x 12" (305 x 305)

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


Free Area: 7.7 ft2 (0.72 m2)

Leakage: Class 2


Performance @ Beginning Point of Water Penetration

Free Area Velocity: 1076 fpm (5.46 m/s)

Air Volume Delivered: 8281 cfm (3.91 m3/s)

Pressure Loss: 0.12 in. wg. (31 Pa)


Velocity @ 0.15 in. wg. Pressure Loss: 1184 fpm (6.02 m/s)

Design Load: 120 psf

Operating Temperature Range: -20oF to + 180oF (-7oC to + 82oC)

AMCA 540 and 550 Listed
AMCA Certified for Water Penetration and Air Performance

Miami-Dade Country Approved: NOA No. 21-1122.05
Florida Building Code Approval (2020 FBC): No. FL21051


Click to view or check box to add to cart