923-0102 Apple Left Fan Duct, A1398 for MacBook Pro 15inch Retina Late 2012 and Early 2013 NB-5914W
This is a replacement left fan duct for the Retina MacBook Pro released in Mid 2012. This is not the fan. This is the duct which focuses the air flow.
Apple part number: 923-0102
Compatible models: A1398
923-0102 Apple Left Fan Duct, A1398 for MacBook Pro 15inch Retina Late 2012 and Early 2013