An upgrade for ALEXA Classic cameras (ALEXA, ALEXA Plus, ALEXA Plus 4:3, ALEXA M and ALEXA Studio) that replaces the fan in the ventilation shaft with an even more silent fan. Includes: K4.74112.0 - ALEXA XT fan K4.74004.0 - ALEXA XT ventilation grille - Upgrade instructions Note 1: This upgrade can be performed by any ALEXA customer. Note 2: Spare fans for ALEXA cameras can be purchased from ARRI service