The Code applies to all air-conditioned premises where air-conditioning is used intermittently or continuously, with the exception of residential premises, factory production areas, hospitals, polyclinics and laboratories.
It applies to all types of air-conditioning and air-distribution systems.
In setting indoor air quality (IAQ) standard, this Code considers environmental factors, which include thermal, physical, chemical and biological factors. The purpose of the standard is to specify indoor air quality that will be acceptable to building occupants and to minimise the potential of adverse health effects.
For the recommended minimum ventilation rates, the Code should be used in conjunction with the SS 553, which provides guidance for the design, construction, installation, testing, commissioning, operation and maintenance of air-conditioning and mechanical ventilation (ACMV) system.
NOTE 1 - Neither SS 553 nor this Code prescribes specific ventilation rate requirements for zones that contain smoking. ANSI/ASHRAE 62.1 may be referred to if smoking zones are present (see also 4.3.5).
NOTE 2 - Meeting the requirements of this Code might not achieve the acceptable indoor air quality for everyone in all air-conditioned buildings, due to one or more of the following reasons:
(a) The diversity of sources and contaminants in indoor air;
(b) Many other factors that may affect occupant perception and acceptance of indoor air quality, such as air temperature, humidity, noise, lighting and psychological stress;
(c) The wide range of susceptibility and preferences in the population;
(d) Outdoor air brought into the building may be unacceptable or may not be adequately cleaned.
SS 554-2009 history
2009SS 554-2009 Code of practice for indoor air quality for air-conditioned buildings