Indoor Air Quality: Exam 2

Question 1

Definitions:

1. Indoor air quality: The physical, chemical, and biological _____________ of indoor air
2. Sick Building Syndrome: A condition in which occupants complain of a set of symptoms that cannot be related to a specific cause but are alleviated when the occupant leaves the building

Answer 1

1. characteristics

Question 2

Definitions:

1. Building Related Illness: A specific illness with a known cause that is a result of exposure to an ____________

Answer 2

indoor agent

Question 3

Definitions:

1. Thermal Comfort: A state of mind in which a person feels __________ with the thermal environment includes temp, humidity, air movement and activity
2. Ventilation Rate: The amount of outside air that is combined with _______ air that is supplied to the interior space.

Answer 3

1. satisfaction

2. return

Question 4

Sick Building Syndrome And Related Complaints: Factors and sources that affect IAQ:

1. Temperature: 72 - 78F
2. Humidity: 35% (winter) to 55% (summer) RH
3. Carbon Dioxide: from fossil ____
4. Carbon monoxide: tobacco smoke, ___ exhaust
5. Formaldehyde: name a few

Answer 4

3. fuels
4. car exhaust
5. particle board, glue, carpet

Question 5

Sick Building Syndrome and Related Complaints: Factors and sources that affect air quality;

1. Particulates such as: name a few;
2. Volatile Organic Compounds (VOC’s): name a few;

Answer 5

1. water residue, air inlets, carpets, duct insulation

2. copy machines, cleaning material, perfumes, hair sprays, solvents, computers

Question 6

Sick Building Syndrome and Related Complaints: Factors and sources that affect indoor air quality;

1. Microbial matter such as stagnant water in vac system;
   name a few locations where this water may be found.

Answer 6

1. humidifiers, cooling towers, drain pans

Question 7

General Indicators of Pollutant sources: TRUE OR FALSE

• Overcrowding
• Unsanitary conditions
• Dust accumulation (housekeeping)
• moisture problems (visible fungal growth)
• Staining or discolouration of ceiling tile or walls

Answer 7

True

Question 8

Airborne particles are extremely ______

Answer 8

small

Question 9

A micron is 1/1000th of a _________

Answer 9

millimetre

Question 10

The smallest particles seen by the naked eye; about __ microns

Answer 10

20

Question 11

A typical human hair is about ___-100 microns

Answer 11

50

Question 12

Classes of filters: Mechanical;

1.
2. dry ______

Answer 12

1. Impingement

2. dry media

Question 13

Classes of filters: Electronic;

1. Air _______ or ______

Answer 13

1. air washers or scrubbers

Question 14

What is the third class of filter besides mechanical and electrical?

Answer 14

ultraviolet

Question 15

Mechanical adsorption cleanable; material used is metal panels or fine _____ screens or a combo of both

Answer 15

fine mesh

Question 16

Mechanical adsorption cleanable will have an adhesive coating which is often mineral oil thus the name _______

Answer 16

viscous

Question 17

Dry media filters are class _ fire resistant, as the name suggests this type of filter lacks the tacky coating of ______ impingement filters

Answer 17

1

viscous

Question 18

Name a few types of dry media filters;

1. plain _____
2. pleated _____ (increased surface area)
3. ___ filter
4. _______

Answer 18

1. plain panel
2. pleated panel
3. bag filter
4. cartridge

Question 19

Dry media filters can be impregnated with activated carbon or zeolite for the removal of organic based odours such as; name 3

Answer 19

1. cooking
2. ozone
3. cigarette smoke
4. disinfectants
5. mould or mildew

Question 20

Understanding MERV Ratings

1. Merv ratings are used to rate the ability of an air conditioning filter to remove ____ from air as it passes through the filter.
2. MERV is a standard used to measure the overall efficiency of a _______
3. ______ MERV ratings mean fewer dust particles and other airborne contaminants that can pass through the filter

Answer 20

1. dust
2. filter
3. higher

Question 21

MERV ratings range from 1-__ and measurements are in ______

Answer 21

1-16, microns

Question 22

TRUE OR FALSE

Some of the common particles related to MERV ratings are pet dander, insecticide dust, smog, dust, viruses, wood, tobacco, smoke, spore, bacteria, and pollen.

Answer 22

True

Question 23

MERV 5-__ rated filters are a better choice and are more commonly found in commercial applications. These filters will collect particles as small as 3 microns and are a good choice for home owners also.

Answer 23

5-8

Question 24

Filters with a MERV rating of 9-12 are used in __________ and ________ applications and will stop particles in the 1-3 micron range

Answer 24

commercial and industrial

Question 25

The most efficient filters have merv ratings of 13-16 and will stop particles as small as __ microns. These filters are used in hospitals and other super clean.

Answer 25

.3 microns

Question 26

Electronic filters are used in applications where very _____ air cleaning efficiency is required

Answer 26

high

Question 27

Electronic filters remove particles by __________ precipitation (which is the attraction of opposite charged particles)

Answer 27

electrostatic

Question 28

Warning: care must be taken when servicing electronic filters due to the very high _______

Answer 28

voltages

Question 29

Air washers: Types; 1. Water _____ 2. Wet _______ coils Note: these are highly effective for removing ______ particulates

Answer 29

1. water sprays 2. wet cooling coils Note: These are highly effective for removing liquid particulates

Question 30

Ultra violet is the most effective for killing bacteria as well as _______

Answer 30

viruses

Question 31

HVAC Heating Systems: Hydronic distribution systems types; 1. Air water systems; hot water or steam is supplied to a central air handler or individual fan ____ units 2. All water systems; Hot water or steam is supplied to building convection _____ 3. Normal hot water or low pressure temperature range from _____ to 260F

Answer 31

1. coil 2. units 3. 200-260F

Question 32

Low temperature water is normally operating at 30psi with a max temp of ___F

Answer 32

250F

Question 33

Medium temp water normally operates at 130psi and has a max temp of ___F

Answer 33

350F

Question 34

High temperature water normally operates at 300psi and has a max temp of ____F

Answer 34

450F

Question 35

Dual temperature water uses both ___ and ______ water

Answer 35

hot and chilled water

Question 36

Chilled water systems normal operating pressure is 125psi with a water temp of 40-___F

Answer 36

40-55F

Question 37

minimum percentage of outside air?

Answer 37

20%

Question 38

Humidity Control: Humidity levels of 35% to __%

Answer 38

35-55%

Question 39

Humidity note: True or False 1. When levels vary above or below limits studies have shown that bacteria/viruses/fungi and other organisms become more active (humidity above recommended) 2. Dry air tends to draw moisture out of carpets/furniture/woodwork/pants as well as increasing static electricity (humidity below recommended)

Answer 39

True

Question 40

Do you want higher or lower temperature in the summer? and why?

Answer 40

higher because the air will be more dry from air conditioning.

Question 41

Dehumidification: Methods; 1. cooling ____ 2. cooling/_________ 3. ________ system

Answer 41

1. cooling coil 2. cooling/reheating 3. desiccant system

Question 42

Humidification Methods; Evaporative type: 1. Wetted ____ 2. Heated ____ (commercial applications)

Answer 42

1. wetted drum | 2. heated pan

Question 43

Humidification Methods: Atomizing type; | 1. ______ (commercial applications)

Answer 43

spray

Question 44

Humidification Methods: Steam Type; 1. ______ injection

Answer 44

steam injection

Question 45

Electric steam generation: 1. Electric steam injection for ducted or non ducted systems. Uses electricity to generate ______

Answer 45

steam