| a) | means any indoor, enclosed or partially enclosed area in which employees perform the duties of their employment; and |
| b) | includes any corridor, lobby, stairwell, elevator, cafeteria, washroom or other common area frequented by such employees during the course of their employment; but |
| c) | excludes any private dwelling, and any portion of an area mentioned in paragraph (a) specifically designated by the employer as a smoking area and which complies with the prescribed requirements. |