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).

Annual Fuel Utilization Efficiency applies to furnaces – both gas and oil.  It describes the percentage of heat produced for every dollar of fuel  consumed.

The process of installing dampers in ductwork to direct airflow throughout a building. The dampers allow the contractor to adjust the amount of air that enters a Room.

An IAQ control strategy to remove various  airborne particulates and/or gases from the air. The three types of air  cleaning most commonly used are particulate filtration, electrostatic  precipitation, and gas absorption.

A device used to control temperature and  humidity of the air.

In HVAC it is the control of the quality,  quantity, and  temperature-humidity of the air in an interior space.

Used instead of a  furnace for  electric heating applications. The equipment that includes a  blower or fan,  heating and/or cooling coils, and related equipment such as  controls, condensate drain pans, and air filters. Does not include ductwork,  registers or  grilles.

A substance capable of causing an allergic reaction  because of  an individual’s sensitivity to that substance.

The air external to a building or device.

HVAC term for a passive or mechanical device used  to ventilate an attic space, primarily to reduce heat buildup and moisture condensation.