Mod 28 Exam
Dust particles are usually ___ microns in size
1-200
carbon monoxide is
a result of incomplete combustion of fuel
the ____ Test measure the ability of an air filter to remove atmospheric dust by evaluating the flow rates on both sides of the filter and measuring the quantity of material it captures
atmospheric dust spot efficiency
ASHARE standard 62.1 ties ventilation rates to the number of occupants in a given space True or False
false
HEPA filters tend to decline in performance over time True or False
false
an HRV transfers humidity as well as heat true or false
false
ionic and electronic air cleaners perform significantly better than HEPA filters True or False
false
____ is an advanced technique used to measure air filter performance in which extremely accurate equipment is used to count the number of particles trapped by the filter and also classify the particles by size
fractional efficiency
small solid particles suspended in air and formed by the condensation and solidification of gaseous materials are called____
fumes
airborne microorganisms, such as viruses, fungi, mildew, and yeast are called___ fumes bacteria bioaerosols none of the above
none of the above
a ventilation system is usually designed to allow the air filter pressure drop to be about ____ of the total pressure drop
one-fourth
a gas that can function as a disinfectant in certain applications but can be detrimental to human health in higher does describe
ozone
____ filters use an electrostatic charge that is produced by the friction of air blowing across the fibers in the filter
passive electrostatic
ultraviolet lights ____
are harmful to eyes and skin
air filters should be changed at approximately ____ of design final resistance
80%
ultraviolet lamps should handle ____ of the bacteria in residential and commercial systems
80-90%
electronic air cleaners use a prefilter to give a negative charge to passing particles True or False
False
certain types of ____ act as breeding grounds for various microorganisms water spray systems humidifiers wet porous surfaces all of the above
all of the above
____ is/are composed of solid particles carried into the atmosphere by gaseous products of incomplete combustion
smoke
Ashrae standard 52.2 rates a filters efficiency by the size of the particle that the filter will capture true or false
true
Ionizing air cleaners may produce ozone as a by product True or False
true
air filters tend to unload excess contaminants once their capacity has been reached True or False
true
many typical air-conditioning applications provide a favorable, damp environment for the growth and development of mold True or False
true
ozone can be used to purify water, remove odors, of to maintain a sterile atmosphere True or False
true
an ERV is ____
used where humidity control is important