lesson 8 chapter 5
the ASHRAE standard that is used to determine acceptable indoor air quality is
ASHRAE standard 62.1
air cleaning systems that utilize ultraviolet light target which type of UV?
UV-C
if an air filter is installed in a ceiling mounted return grille and the evaporator coil is dirty, which of the following is not a possible cause?
air leaks in the supply duct
pleated filters are desirable because they
have greater surface area than non pleated filters
generally speaking, ventilation has a
negative effect on the efficiency of both heating and cooling systems
the main drawback of using a high MERV filter is that the
pressure drop across them is too high
sick building syndrome is a blanket term used to describe
the cause for health problems associated with poor indoor air quality
death from carbon monoxide can result if continued exposure exceeds
800 ppm
the main difference in HRV and an ERV is that
an ERV has the ability to recover both latent and sensible heat
dust mites and mold fall under which classification
biological contaminants
all of the following should be taken into account when sizing humidifiers except the
desired indoor air temperature
an electronic precipitator is the same as a
electronic air cleaner
with regards to air filtration, the term face loading occurs when the
front side of the filter becomes clogged with dirt
the plenum mound humidifier is mounted
in either the supply plenum or the return plenum
carbon monoxide is commonly formed when
incomplete combustion takes place
for which level of mold contamination are trained maintenance staff members permitted to perform mold cleanups
level 1 and 2
asbestos is known to cause which of the following health problems?
lung cancer
care should be taken when handling UV lamps because they contain
mercury
how many compounds are found in tobacco smoke?
over 1000
which of the following is generally true regarding the amount of time people spend indoors and outdoors?
people spend as much as 90% of their time indoors
the effects of tight building construction can be offset by
providing mechanical ventilation
of the following are methods used to control indoor contamination except
sealing all leaks in the building envelope
a heat recovery ventilator transfers
sensible heat from the intake air to the exhaust air in the cooling mode
to help keep the entire return duct clean and dirt free
the air filter should be as far from the air handler as possible
which part of the electric air cleaner is responsible for charging the dust and dirt particles
the ionizing section
the most common source of radon is
uranium
for which level of mold contamination myst individuals performing the remediation be trained in the handling of hazardous materials?
level 3 and 4
HEPA filters can capture particles in the air that are as small as
0.3 microns
the efficiency of a MERV 7 filter is approximately
30%
the recommended relative humidity for a home is between
40% and 60%
ion generators are used to promote clean environments by causing contaminants to
bond to each other, making them larger and easier to capture in air filters.
of the following, which groups of individuals are most likely to suffer from poor indoor air quality related illnesses?
chronically ill people and the elderly
the filter type that is best suited for high humidity applications is the
cube filter
which of the following is true regarding mold?
living and dead molds can cause human health problems
what is the driving force that moves air through a bypass humidifier?
the pressure difference between the supply and the return airstreams
in the winter months, humidification is often needed because
the relative humidity of air decreases as it is heated
the V in a filters MERV raing stands for
value
