Deck 34: Indoor Air Quality

Question 1

The humidifier should exhaust directly onto air filters and electronic air cleaners.

Answer 1

False

Question 2

What level of mold contamination corresponds to areas from 10 to 30 square feet?

A) Level I.
B) Level II.
C) Level III.
D) Level IV.

Answer 2

B

Question 3

A pleated filter ____.

A) does not clog up as quickly as a standard filter
B) has much more surface area that non-pleated filters
C) costs less than a standard filter
D) Both a and b.

Answer 3

D

Question 4

Environmental tobacco smoke (ETS) is often referred to as ____________________.

Question 5

The air in the home feels dry when it is heated because it expands, spreading out the moisture.

Question 6

One of the most common substances used as an absorber is ____.

A) charcoal
B) silica gel
C) fiberglass
D) foam rubber

Question 7

Caution must be used with changing from one air-cleaning filter type to another. If a technician replaces a low-density filter with a high-density filter it is very likely that the airflow will be reduced.

Question 8

A house is built on property whose soil is rich in uranium. The occupants of the house may ____.

A) be exposed to radon gas
B) be more susceptible to lung cancer
C) smell the pungent odor of the radon
D) Both a and b.

Question 9

What are the relative humidity limits recommended for residences?

A) 20% to 40%.
B) 30% to 50%.
C) 40% to 60%.
D) 50% to 70%.

Question 10

Humidification generally relates to the process of causing water to ____ into the air.

A) condense
B) evaporate
C) be ionized
D) be filtered

Question 11

The steps to aggressively controlling the contamination of indoor air would involve ____.

A) locating and eliminating the source of contamination
B) providing adequate ventilation
C) providing methods for cleaning the air
D) All of the above.

Question 12

A fiberglass media air filter contains a dust-holding adhesive that helps prevent particulates from ____.

A) migrating downstream
B) migrating upstream
C) absorbing odors
D) releasing spores

Question 13

People who are active and spend a great deal of time outdoors are more likely to experience the effects of pollution.

Question 14

Electronic air cleaners generally have ____.

A) ionizing sections
B) charcoal filters
C) prefilters
D) All of the above.

Question 15

____________________ filters have large surface areas and require a deep filter case.

Question 16

Because humidifiers use water, the evaporative surfaces and water reservoir must be cleaned and sanitized regularly to prevent the distributions of ____ by the moving airstream.

A) fungi
B) bacteria
C) algae
D) All of the above.

Question 17

The controller for a humidifier, a humidistat, has an element that is ____-sensitive.

A) moisture
B) light
C) infrared
D) temperature

Question 18

An atomizing humidifier should not operate when the furnace and blower are not operating.

Question 19

The American Society of Heating, Refrigeration and Air Conditioning Engineers (ASHRAE) has guidelines governing indoor air quality. These guidelines are called ASHRAE Standard ____________________.

Question 20

Atomizing humidifiers discharge ____ into the air.

A) CO₂
B) electronic ions
C) carbon dioxide
D) tiny water droplets

Question 21

The atomizing humidifiers can be spray-nozzle or ____________________ types.

Question 22

How can the installation of a humidifier help to reduce heating costs?

Question 23

Air in homes tends to be drier in the winter. Why?

Question 24

HEPA filters can filter to a very high efficiency, down to a(n) ____________________ micrometers-sized particle or lower.

Question 25

In electric furnace as well as heat pump systems, the recommended humidifier would be a(n) ____________________ type.

Question 26

Define relative humidity.

Question 27

What is the major objection to using an atomizing humidifier with hard water?

Question 28

How does adding humidity to the air in a residence affect the thermostat setting?

Question 29

A supplemental photocatalytic oxidation filter (PCO) is often included with ____________________ air purifiers.

Question 30

In the ionizing section of an electronic air cleaner, the particles in the air are given a positive ____________________.

Question 31

How can humidification be provided in residences that do not have heating equipment with ductwork?

Question 32

Describe atomizing humidification.

Question 33

When odor is a concern, a filter containing ____________________ should be used.

Question 34

How would you check the calibration of a humidistat?

Question 35

Why are HEPA filters desirable?