This is a replacement single fan assembly that includes one 120 mm DC fan and a power wire. The fan is easily replaced by pulling the old fan from the rubber mounts and swapping it with the new fan.
Replacement Notes: When pulling fans from the mounts, ensure to pull gently and work from one corner at a time. The fan mounts can break if pulled too aggressively. When reinstalling the fan, ensure it is positioned to blow air in the desired direction and there is an arrow on the side of the fans which indicates the direction of the airflow.
Polarity. This fan is polarity protected so if polarity is reversed, the fan simply will not operate. Just reverse polarity ensuring that Tip aligns with + on the ends of the connectors