Issue link: https://hi.iaq.net/i/630729
154 Appendix F Diffusers and Grilles — Components of the ventilation system that distribute and diffuse air to promote air circulation in the occupied space. Diffusers supply air and grilles return air. Disinfectants — One of three groups of antimicrobials registered by EPA for public health uses. EPA considers an antimicrobial to be a disinfectant when it destroys or irreversibly inactivates infectious or other undesirable organisms, but not necessarily their spores. EPA registers three types of disinfectant products based upon submitted efficacy data: limited, general or broad spectrum, and hospital disinfectant. EPA — United States Environmental Protection Agency. ETS — Environmental tobacco smoke. Environmental Agents — Conditions other than indoor air contaminants that cause stress, comfort, and/or health problems (e.g., humidity extremes, drafts, lack of air circulation, noise, and over- crowding). Ergonomics — Applied science that investigates the impact of people's physical environment on their health and comfort (e.g., determining the proper chair height for computer operators). Exhaust Ventilation — Mechanical removal of air from a portion of a building (e.g., piece of equipment, room, or general area). Gas Sorption — Devices used to reduce levels of airborne gaseous compounds by passing the air through materials that extract the gases. The performance of solid sorbents is dependent on the airflow rate, concentration of the pollutants, presence of other gases or vapors, and other factors. HEPA — High efficiency particulate arrestance (filters). HVAC — Heating, ventilation, and air- conditioning system. Hypersensitivity Diseases — Diseases characterized by allergic responses to animal antigens. The hypersensitivity diseases most clearly associated with indoor air quality are asthma, rhinitis, and hypersensitivity pneumonitis. Hypersensi- tivity pneumonitis is a rare but serious disease that involves progressive lung damage as long as there is exposure to the causative agent. IAQ — Indoor air quality. IPM — Integrated pest management. Indicator Compounds — Chemical compounds, such as carbon dioxide, whose presence at certain concentrations may be used to estimate certain building condi- tions (e.g., airflow, presence of sources). MCS — See "Multiple Chemical Sensitiv- ity." MSDS — Material Safety Data Sheet. Make-up Air — Air brought into a building from the outdoors through the ventilation system that has not been previously circulated through the system. Microbiologicals — See "Biological Contaminants." Multiple Chemical Sensitivity — A term used by some people to refer to a condition in which a person is considered to be sensitive to a number of chemicals at very low concentrations. There are a number of views about the existence, potential causes, and possible remedial actions regarding this phenomenon. NIOSH — National Institute for Occupa- tional Safety and Health. NTIS — National Technical Information Service. Negative Pressure — Condition that exists when less air is supplied to a space than is exhausted from the space, so the air pressure within that space is less than that in surrounding areas. OSHA — Occupational Safety and Health Administration.