  We investigate the stationary nonequilibrium states of a quasi
one-dimensional system of heavy particles whose interaction is mediated by
purely elastic collisions with light particles, in contact at the boundary with
two heat baths with fixed temperatures $T^+$ and $T^-$. It is shown that
Fourier law is satisfied with a thermal conductivity proportional to
$\sqrt{T(x)}$ where $T(x)$ is the local temperature. Entropy flux and entropy
production are also investigated.
