The net sound intensity field in a room containing a random noise source is the vector sum of the direct field and the reverberant intensity field. If the room is diffuse, the net reverberant intensity will be zero and only the direct field will constitute a net intensity flow. The net sound intensity field in the vicinity of a source placed in a diffuse room will therefore be identical to that in a free field, decreasing by 6 dB per doubling of the radial distance from a simple source. In any other environment the reverberant field will also yield a flow and the resulting distortion of the free-field radiation pattern will reflect a lack of directional diffusion. A simple descriptive model of the intensity field in various types of acoustic environment is presented.