HP RC1-7548-000CN Fan duct – Diverts air from Fan 1 to front of printer and helps cool the Low Voltage Power Supply (LVPS) – Duct 3 FacebookTwitter Duct : Fan duct – Diverts air from Fan 1 to front of printer and helps cool the Low Voltage Power Supply (LVPS) – Duct 3 4.5Rate, reveal the bestRating:4.5 -17 votes