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Aluminum Wall Shutter (Front Flanged) - The Model EASR is a front flanged gravity shutter for most exhaust applications. The 1-1/2" flanged frame and blades are mill finish aluminum. The blades have a galvanized reinforcement strip across the top of each blade for added strength and counter balancing efficiency. The blades have a felt seal on the leading edge for quiet closing and better protection from the weather. Ideal for use with cabinet fans and flush mount direct-drive or belt-driven exhaust fans. Recommended for vertical mount exhaust applications only. The maximum free area velocity is 2500 FPM.