The FW29 continues the design philosophy of the FW28 with a zero keel configuration," he said. "The other notable elements of the design include another step in the undercut of the sidepod leading edge (with top louvres for cooling), improved engine and exhaust packaging to address the reliability issues experienced in 2006 and a lower and narrower top deck for improved aerodynamic efficiency.
"The other prominent differences from the FW28 include large chimneys expressly for cooling at the season’s first three races and a narrower engine cover spine.”
Source: Speedtv.com