  We determine the exclusion statistics properties of the fundamental edge
quasi-particles over a specific $\nu=\half$ non-abelian quantum Hall state
known as the pfaffian. The fundamental excitations are the edge electrons of
charge $-e$ and the edge quasi-holes of charge $+{e \over 4}$. We explicitly
determine thermodynamic distribution functions and establish a duality which
generalizes the duality for fractional exclusion statistics in the sense of
Haldane.
