Chapter 1 - The Improtance of Air Filtration Flashcards
(40 cards)
Define Air
A mixture of gasses composed of approximately 21% oxygen, 78% nitrogen, 1% argon and carbon dioxide, and traces of other gases
Where do building contaminants come from?
building materials and finishes building contents such as furniture and fixtures people processes materials in the building cooking odors
Define Aerosol
An assemblage of small particles, solid or liquid, suspended in air. The diameter of the particles may vary from 100 microns down to 0.01 micorns.
How do you measure the size of a aerosol?
Micrometers
How big is a micrometer?
A micrometer is one millionth of a meter or 1/25,400 inch
Define dust
An aerosol of particles of any solid material, usually with particle size less than 100 microns
Define EPA
Environmental Protection Agency. This is the Federal agency that is responsible for setting standards for waterborne and airborne sources of pollution in the United States
Define coarse particles
Formed by the mechanical breakup of solids larger than 3 micrometers
Define fine particles
Formed from chemical reactions or condensing gas with a max size of 1-3 micrometers
Define ASHRAE
American Society of Heating, Refrigeration, and Air-Conditioning Engineers
Define Brownian motion
The continuous zigzag motion of particles (aerosols) in suspension. The motion is caused by the impact of the molecules of the fluid (air) upon the particles
Define Bioaersols
Airborne biological materials including fungi, bacteria and their spores and viruses
Define Fumes
Solid aerosols formed by the condensation of vapors of solid materials
Define Comfort air conditioning
The process of treating air to simultaneously control its temperature, humidity, cleanliness, and distribution to meet the comfort requirements of all the occupants of the conditioned space.
Define Fog
Fogs are liquid aerosols formed by the condensation of water vapor in the air
Define Mists
Mists are liquid aerosols formed by the atomization of liquids
Define smokes
Smokes are solids and/or liquid aerosols formed by the incomplete combustion of organic substances
Define Smog
Smog is a compound mixture of particulates and droplets seen as a haze caused by sunlight induced photochemical reaction
Define Environmental Tobacco Smoke (ETS)
ETS is a compound mass of poly-dispersed smaller sized particles, fumes and vapors created from burning tobacco products
How are particles measured?
By count or weight
Define Gas
A gas is a material that has the tendency to expand indefinitely and which completely and uniformly fills the container it occupies
Define Vapor
Vapors are gases formed by the evaporation of materials that are normally liquid of solid
How are gasses formed
Gasses are formed in a chemical process where they are deliberately prepared for other uses or where they may be the unwanted by-product of a process, by the result of a biological process or from volatile organic compounds (VOCs)
Define Space
Space is the defined area, usually enclosed by walls and a ceiling or the equivalent
