The LASER system falls into class 3B or 4 and the beam is free (the LASER beam is mounted on a manually steerable handpiece; the manufacturer did not embed it into a housing; e.g. hand-held LASER handpieces as in an aesthetic or hospital setting, industrial LASERs that require the presence of the operator in the immediate proximity of the free beam).
The manufacturer declares a NOHD (Nominal Ocular Hazard Distance) lower than 20 cm.
There are no other minimal constraints on the operating environment. E.g. the walls may not arrive until the ceiling, provided that they are made by a non-flammable material; in the case of a housing, it shall prevent the operators from moving closer than 20 cm.