The AEL-42 louver is a 1.122-inch deep thinline stationary louver that is primarily used for PTAC, glazing mechanical screen and other aesthetic applications where water penetration is not a concern. Architectural PTAC louvers enhance the outside appearance of any facility that uses Packaged Terminal Air Conditioners and Heat Pumps. With a Reliable louver, users are assured that a PTAC unit’s performance will not be hindered due to incorrect intake/exhaust placement or incorrect A/C unit attachment.