treated-area
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treated area
Also called: TA
HB50
sum of all areas at all building levels to which a particular engineering service is provided
Unit: square metres (m2).
It is computed by measuring from the normal inside face of exterior walls (ignoring any projections) to the centreline of internal walls which enclose the area treated. A treated area may need to be computed separately for each engineering service. For such services as space heating, ventilation, evaporative cooling and air conditioning, the treated area should include all areas to which treated air is supplied. For fire protection, the treated area comprises the sum of protected floor space, the area of protected ceiling spaces and the area of protected under-floor spaces.