Air Filtration: Exam 2 Flashcards
The term ____ refers to the small particles that become temporarily airborne from wind, as sudden earth disturbance, or mechanical work on a solid.
dust
Which of the following is a gaseous pollutant?
- radon
- asbestos
- fumes
- bacteria
radon
Airborne microorganisms such as viruses, fungi, mildew, and yeast are called;
- fumes
- bacteria
- bioaerosols
- none of the above
bioaerosols
______ are simple, single cell microorganisms that are responsible for many diseases.
bacteria
______ is a naturally occurring mineral that forms fibre bundles
- carbon
- yeast
- pollen
- none of the above
none of the above
Filter efficiency is measured by the
- degree of discolouration
- total weight of dirt collected
- size of the smallest particle that can be removed
all of the above
____ is an advanced technique used to measure filter performance in which extremely accurate equipment is used to count the number of particles trapped by the filter
fractional efficiency
In most electronic air cleaners, the largest particles and dirt are removed by a pre_____
prefilter
Ultraviolet lamps should be replaced _____
yearly
ultraviolet lamps should remove ____ of the bacteria in residential and commercial systems
- 75-80%
- 80-90%
80-90%
T or F
The least economical way to maintain health and comfort conditions is by bringing in outside air to ventilate the space.
False
T or F
A pollen count is a measurement of the amount of pollen each type of plant releases
false
T or F
Carbon monoxide may be found inside homes or offices due to cracked heat exchangers
true
T or F
ozone can be used to purify water, remove odours, or to maintain a sterile atmosphere
True
T or F
Sensitivity to indoor pollutants varies from person to person
True
T or F
A systematic investigation should be performed by a trained technician if the occupants of a building complain about building related symptoms
True
T or F
To qualify as a HEPA filter under US gov standards, a filter must capture 95% of airborne particles 0.3 microns or larger
False
T or F
Filters tend to unload excess contaminants once their capacity has been reached
True
T or F
In a typical heat exchange installation, stale air is removed from bathrooms, laundry rooms, and kitchen
True
T or F
As incoming fresh air and outgoing stale air passes through the HRV, heat is exchanged, so the incoming air is closer to the temperature of the outgoing air
True
When an atom has an imbalance of electrons and protons , the atom is _____
ionized
The ASHRAE standard by which air filters and electronic air cleaners are rated is ASHRAE standard ____
52.2
A natural exchange of air through leakage into a building is known as ______
infiltration
A heat exchanger that passes incoming fresh air and outgoing stale air through a series of parallel passages and also transfers humidity is called a energy _______ _______ (ERV)
energy recover ventilator (ERV)
A natural passage of air leaving a building through doors, windows, and other construction joints is referred to as ex-_______
ex-filtration
What is multiple chemical sensitivity (MCS)?
adverse reactions to low levels of chemicals
By what three factors is filter efficiency measured?
- total weight of dirt
- colour
- smallest particle that can be removed
What is static electricity?
build up of charged particles
What components does a complete air quality system combine?
AC, furnace, air purifier, UV, ERV, HRV
List three primary causes of poor indoor air quality (IAQ) in homes?
- decreased fresh air filtration
- building materials used improperly
- moisture/seapage
