1. In this Regulation, unless the context requires otherwise,“business and personal services occupancy” means the occupancy or use of a building or part thereof for the transaction of business or the rendering or receiving of professional or personal services;
“dual-duct systems” means a mechanical ventilation system in which the air supplied by separate hot and cold air ducts is mixed at terminals to meet thermostatic demand;
“dwelling unit” means a room or suite of rooms used or intended for use as a domicile by one or more persons for cooking, living, sleeping purposes and usually containing sanitary facilities;
“floor area” means the space on any story of a building between the interior face of the exterior walls and the required firewalls, including the space occupied by interior walls and partitions, but not including exits and vertical service spaces that pierce the storey;
“hospital, aid or detention centre” means a building or part thereof occupied by persons who require special care or treatment because of age, mental or physical limitations or who are involuntarily detained for penal or correctional purposes, or whose liberty is restricted;
“major occupancy” means the principal occupancy, of a building or part thereof. Major occupancy is considered as including any subsidiary occupancy which is an integral part of the principal occupancy;
“mercantile occupancy” means the occupancy or use of a building or part thereof for the display or sale of retail goods, wares or merchandise;
“reheat” means the application of sensible heat to supply air that has been previously cooled below the temperature of the conditioned space by mechanical refrigeration or the introduction of outside air to provide cooling;
“residential occupancy” means a building or part thereof used as a living place by persons for whom sleeping accommodation is provided, with the exception of a hospital, aid or detention centre;
“shading coefficient” means the ratio between the total solar heat gain through the glazing and the total solar heat gain through an ordinary clear plate glass 4 mm thick, subject to the very same conditions;
“thermal resistance” means the inverse of the quantity of thermal energy passing through a unit area of a material, from one face to the other, within a unit time, when the temperature difference between the two surfaces is equal to one degree.