Nissan Urvan air filter location

I take it these are mid engined?

On most of these mid engined japanese vans, you're looking underneath the vehicle, for a large black cylindrical container, perhaps half way back? I don't know the vehicle specifics, but that's where i'd be looking. Otherwise follow the pipe from the inlet manifold if you can see it.

Sorry I can't be more help, as I said, I don't know the vehicle specifics. I'm just thinking it'll be the same layout as a cabstar, or mazda bongo