Guidelines for national indoor environmental quality requirements

Summary of key guidelines for national IEQ regulatory requirements: • Minimum requirements for indoor air quality, thermal comfort, lighting, and acoustic are to be set in the regulation for new buildings and major renovations; • Indoor air quality, ventilation and thermal comfort requirements can be specified separately for residential and non-residential buildings; • In non-residential occupied buildings, ventilation capacity must be 7 L/s per person plus 0.7 L/s per m2 floor area, or alternatively CO2 concentrations of 900-1200 ppm, depending on occupant density, must be fulfilled; • In residential buildings an average ventilation capacity of a whole residence shall be 0.42 L/s per m2 floor area and 7 L/s supply air per person which are recommended to be supported with room-based ventilation rate requirements; • Room temperature ranges in residential and non-residential buildings must be specified for heating and cooling seasons; • Establishing a requirement on the lower limit of relative humidity in cold climates and upper limit in southern humid climates can be considered; • Requirements shall be specified so that it is possible to assess the compliance based on monitoring, measurements or simulations, therefore it is important to specify acceptable deviations; • Application of measuring and control devices for the monitoring and regulation of indoor environmental quality shall be required at relevant unit level; • Conducting continuous measurement of main indoor environmental quality indicators shall be required from continuously occupied spaces; • It is good to support regulatory requirements with technical guidelines for the design and operation.