Do plants, radiators and bins (trash cans) have to be near a patient or an employee to have an effect on them? Or will just simply placing these items have an effect on the whole area (everywhere outside, if outside; the whole room, if inside a room)? If not, how many tiles does the effect of these items reach? Are their effects different if these items are outside or inside a room?
Asking info for both Theme Hospital, and its updated, open source reimplementation, CorsixTH. If the mechanics are different, please specify the differences.