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Extruded Aluminum Door Louvers – The Model ADL is a heavy duty door louver. The flanged frame has staked mitered corners for added strength. The blades are inverted V style spaced on approximately 5/8" centers for maximum privacy. The louvers can be used for the transfer of air through any barrier and are ideal for use with 1-3/8" to 2-1/4" thick wood or metal doors. Available in Extruded Aluminum (ADL) and comes standard with color matched #8 x ¾" Phillips head mounting screws. The Model ADL comes standard with a 204-R1 clear anodized finish.