Glossary

IAP

Indoor air pollution. 

IAQ

Indoor air quality. 

Ignite

To heat a gaseous mixture to the temperature at which combustion takes place. 

Ignition Point

The minimum temperature at which combustion of a solid or fluid can occur. 

Indoor Air

The air the people breathe inside a built environment. 

Indoor Air Pollutant

Particles and dust, fibers, mists, bioaerosols, and gases or vapors. 

Infiltration

Air leakage inward through cracks and interstices and through ceilings, floors, and walls of a space or building. 

Inhalable

Particles small enough to be inhaled, but large enough so that they are not quickly exhaled. 

Integrated Heating Systems

HVAC term for a type of heating appliance that performs more than one function, for example space and water heating. 

Ion

An electrically charged atom or group of atoms that has lost or gained electrons; a loss makes the resulting particle positively charged; a gain makes the particle negatively charged. 

Ionizer

A device that removes airborne particles from breathable air. Negative ions are produced and give up their negative charge to the particles. These new negative particles are then attracted to the positive particles surrounding them. This accumulation process continues until the particles become heavy enough to fall to the ground.