Asus ESC4000/IB - Manual (Page 65)

ASUS ESC4000 Series 4-11
3. Front fan connectors (4-pin FRNT_FAN1–7)
The fan connectors support cooling fans of 3.30A–3.95A (47.4W max.)
Connect the fan cables to the fan connectors on the motherboard, ensuring
that the black wire of each cable matches the ground pin of the connector.
• DO NOT forget to connect the fan cables to the fan connectors. Insufficient
air flow inside the system may damage the motherboard components.
• These are not jumpers! DO NOT place jumper caps on the fan connectors!
• All fans feature the ASUS Smart Fan technology.