Mondeo Duratec 2.5 v6 is a duratec 25 which is chain driven on both sides.

by looking at the engine. if it says duratec it has 24 if not duratec it has 12

how do you get the air filter box off ford fiesta duratec

On the driver side of the engine, it is the only thing run by a short belt under the plastic cover which has the 24 valve duratec v6 logo on it.

Yes,its a fairly straight fit as most of the parts can be used off a fiesta st which is a 2.0 duratec as well.