Inspecting a dentist office of new construction. A framed wooden structure with a T.V. monitor mounted directly under it covers a sprinkler head. This is in a patient room directly over the patient chair and it is the only sprinkler head in the room. Our office was discussing the 4' wide rule. We got hung up on width versus length. I assume it all depends on orientation of the room. Can you give any clarification on the blockage of sprinkler heads?