  The field equation for a spin 1/2 massive charged particle propagating in
spacetimes that are the direct product of 2-dimensional spaces is separated.
Moreover, we use this result to attain the separability of the Dirac equation
in some specific static black hole solutions whose horizons have topology
$\mathbb{R}\times \mathbb{S}^2 \times \cdots \times \mathbb{S}^2$.
