Why is Ventilation important?
Poor IAQ occurs when ventilation is inadequate in keeping contaminant concentrations at levels that do not produce occupant health problems. The HVAC system must not only control contaminants, it must provide a comfortable environment. The perception of still or stale air, odor, draftiness, or errant temperature and humidity leads to discomfort; and discomfort, however subtle, can be the beginning of IAQ complaints. In general, IAQ complaints originate with the HVAC system failing to meet occupant needs. Of the more than 1200 IAQ investigations performed in recent years by the National Institute for Occupational Safety and Health (NIOSH), over half were attributed to inadequate ventilation. What Can Be Done About IAQ Complaints? First, either through interviews or by questionnaire, determine: • What are the specific complaints? • Where in the building are similar concerns about IAQ occurring? • When does the problem occur? • When and where did it first occur? • Who is affected? • What
