PMC

Schematics are shown of the six rooms in the study, with the modification to improve natural ventilation annotated. Room ventilation (air-changes/hour; ACH) is shown alongside as measured pre- and post-modification. The following 6 rooms are shown: 1. General medical out-patients waiting room. 2. General medical out-patients consulting room. 3. X-ray department waiting room. 4. Respiratory medicine & TB clinic waiting room. 5. Respiratory medicine out-patients consulting room. 6. General medical and respiratory medicine out-patients waiting room

Depiction of Freud’s Office Architecture: Study (left) and Consulting Room (right). If Freud directed his gaze diagonally across the room into his study from his consulting room chair, his study chair was directly in his line of vision ( by Julia K. Schroeder).

The left image shows a floor plan of Sigmund Freud’s office at Berggasse 19 in Vienna, Austria. Note that the consulting room and study are conjoined by an open doorway. The door between the waiting room and the consulting room is sealed. The right image shows a floor plan of King Tutankhamun’s tomb. Note that the burial chamber and treasury are conjoined by an open doorway. The door between the antechamber and burial chamber is sealed. ( by Julia K. Schroeder).

Risk of TB infection and room ventilation. The risk of TB infection for patients waiting an average of 3 h in a waiting room, or for a healthcare worker working for 6 h in a consulting room, is shown. TB risk was calculated using the room ventilation rate measured in each room either pre-intervention (blue triangles) or post- intervention to improve natural ventilation (red circles)