  We model farinfrared (FIR) spectra of radioweak quasars with the assumption
that the emission is from heated dust, and that the heating is due to the
central engine via energetic particles. These energetic particles are diffusing
from a postulated source near the central engine through a tenuous galactic
halo to arrive at the dust which is taken to be in molecular clouds in a disk
configuration. This picture does not depend on a particular geometry of the
disk such as warps. This concept can readily reproduce the range of observed
mm/submm/FIR/IR spectra.
