  It is shown that when beams interact with a residual gas at $\phi$-factories
the reaction of the electroproduction of the $\Delta (1232)$ isobar proceeds
vigorously. The isobar decay gives $\sim 10^7$ pions during an effective year
of $10^7$ s per meter of a residual gas. These pions are emitted largely across
the beam axis and have a resonance energy distribution with a peak nearby 265
MeV of a width close to 120 MeV in the isobar rest system. There are presented
formulae for the distributions of the four-momentum transfer square, the
angles, the energies and the momentum of the decay products, that is all
required for the simulation of the process under consideration.
