Standard 62.1

Question 1

What is the name of Standard 62.1

Answer 1

Ventilation for Acceptable Indoor Air Quality

Question 2

Which buildings are excluded from Standard 62.1?

Answer 2

Single-family homes, multi family structures of 3 stories or fewer above grade, vehicles, aircrafts

Question 3

Is thermal control included in Standard 62.1?

Answer 3

No

Question 4

Define: ambient air

Answer 4

The air surrounding a building; the source of outdoor air brought into a building

Question 5

Define: Air makeup

Answer 5

Combination of outdoor and transfer air intended to replace exhaust air and exfiltration

Question 6

Define: transfer air

Answer 6

Air moved from one indoor space to another

Question 7

Define: breathing zone

Answer 7

The region within an occupied space between planes 3 in - 72 in above the floor and more than 2 feet from the walls or fixed AC equipment

Question 8

Define: Demand-controlled ventilation (DCV)

Answer 8

Any means by which the breathing zone of outdoor airflow (Vbz) can be varied to the occupied space(s) based on actual/estimated # of occupants and/or ventilation requirements

Question 9

Define: energy recovery ventilation system

Answer 9

A device or combination of devices applied to provide the outdoor air for ventilation where energy is transferred between intake and exhaust airstreams

Question 10

Define: Environmental tobacco smoke (ETS)

Answer 10

Second hand smoke

Question 11

Define: exfiltration

Answer 11

Uncontrolled outward air leakage from conditioned spaces to unconditioned/unwanted spaced due to pressure differences, leaks, wind, etc.

Question 12

Define: Stack effect

Answer 12

Inside-outside temperature differences causing colder air towards the bottom and and increasingly warm air above

Question 13

Define: Infiltration

Answer 13

Uncontrolled inward air leakage to conditioned spaces through unintentional openings.

Question 14

What are some examples of natural ventilation?

Answer 14

Thermal, wind, or diffusion effects through doors, windows, etc.

Question 15

What are some exclusions to “net occupiable area”?

Answer 15

Shafts, column enclosures, and other permanently closed, inaccessible occupiable areas.

Question 16

What does NAAQS stand for?

Answer 16

National Ambient Air Quality Standards

Question 17

What source is needed to find out regional air quality?

Answer 17

US EPA

Question 18

Define: Plenum system

Answer 18

A type of air-conditioning system in which air is passed into a room at a pressure greater than atmospheric pressure. Recirculates return air and distributes ventilation air.

Question 19

What is the difference between a ducted return and a plenum return?

Answer 19

Ducted return is designed for air to flow back into the air handler while plenum return is not ducted back to the air handler, but goes freely into open plenum space.

Question 20

FPM stands for…

Answer 20

Feet per minute (FPM) is the most common way to express air velocity

Question 21

Define Louver

Answer 21

The Louver is a kind of a shutter or blind that comes with horizontal slats that are angled to allow space for light and air but restrict rain and direct sunlight whereas dampers control the airflow. In HVAC systems, dampers and louvers are used to regulate the flow of air.

Question 22

Define: Bird Screen

Answer 22

Screen device should be designed to prevent penetration by 0.5 in diameter probe. This is to prevent bird nesting that may affect outdoor air intake

Question 23

Define: MERV value

Answer 23

Common term “minimum efficiency reporting value.” An air filter’s minimum efficiency reporting value (MERV) rating measures how effectively the filter stops dust and other contaminants from passing through the filter and into the air stream. Filters with higher MERV ratings trap small particles more effectively than filters with lower MERV ratings. In general, filters with a rating of MERV 16 or below are considered to be HVAC-system-grade filters for residential, commercial and general hospital use. MERV 17 through MERV 20 filters are typically used in surgical operating rooms, clean rooms and other contexts that require absolute cleanliness.

Question 24

Describe Particulate Matter Removal

Answer 24

Particulate matter filters or air cleaners having a minimum efficiency 8 shall be provided upstream of all cooling coils/wetted devices when air is traveling to an occupiable space

Question 25

Scroll down for MERV chart

Answer 25

https://www.grainger.com/know-how/equipment-information/kh-what-is-merv-rating-air-filter-rating-chart#:~:text=An%20air%20filter's%20minimum%20efficiency,filters%20with%20lower%20MERV%20ratings.

Question 26

Regarding dehumidification systems: Occupied-space relative humidity shall be limited to \_\_% or less

Answer 26

65%

Question 27

What is the required drain pan slope?

Answer 27

Min .125 in./ft. or otherwise designed to drain freely

Question 28

What is the purpose of the fins on finned tube coils?

Answer 28

The tubes are staggered and not in-line; while the fins are designed to help break up the airflow and not facilitate an easy, straight-through air path. Dirt and/or other particles in the air get caught easily, which again, is why coils can act as great filters

Question 29

Define: air washers

Answer 29

A type of water-spray system. They are a combination of humidifier and air purifier in one, creating an ideal indoor climate when the indoor air is dry and polluted. During humidification, pollutants are washed from the air and only clean, optimally humidified air is emitted back into the room at the same time.

Question 30

What is a direct evaporative cooler?

Answer 30

A type of water-spray system. Direct evaporative cooling systems put the process fluid, typically water, into direct contact with air. Water flows through fill as a fan draws air across it, facilitating the transfer of heat from the warm water to the cooler air.

Question 31

What is the purpose of turning vanes?

Answer 31

The primary purpose of turning vanes is to create a smoother change in direction for the airflow. The resulting reduction in pressure loss is a more efficient system.

Question 32

Define: volume damper

Answer 32

A damper in an HVAC system, also known as Duct Damper or Volume Balancing Damper is a movable plate, situated in the ductwork that regulates the flow of air and redirects it to specific places of a house. The usage of dampers is typically seen in zoning or zone control systems.

Question 33

What is direct evaporative cooling?

Answer 33

Direct evaporative cooling systems put the process fluid, typically water, into direct contact with air. Water flows through fill as a fan draws air across it, facilitating the transfer of heat from the warm water to the cooler air.

Question 34

What is the function of a plenum?

Answer 34

Plenum boxes are usually situated on either side of the fan or heat exchanger and have the important function of bringing in, distributing, and removing air. They are the air's first stop after being heated or cooled and its last stop before going back into your AC, heat pump, or furnace.

Question 35

Explain building envelope

Answer 35

A building envelope is the physical separator between the conditioned and unconditioned environment of a building including the resistance to air, water, heat, light, and noise transfer.

Question 36

What are some of the ways a building envelope can be sealed?

Answer 36

exterior joints, seams, or penetrations in the building envelope that are pathways for air leakage shall be caulked, gasketed, weather-stripped, provided with continous air barrier, or otherwise sealed to limit infiltrations through the envelope.

Question 37

Explain subslab depressurizaition

Answer 37

The EPA defines sub-slab depressurization technology as "a system designed to achieve lower sub-slab air pressure relative to indoor air pressure by use of a fan-powered vent drawing air from beneath the slab." Thus, even if there are holes, cracks, or other pathways between the commercial building and the subsurface, the vapors will flow downward, not upward. Therefore, a well-designed sub-slab depressurization system will most likely prevent any toxic vapors from intruding above into the building structure.

Question 38

Explain Air Classification 1

Answer 38

Class 1: Air flow with low contanimant concentration, low sensory-irritation intensity, inoffensive odor

Question 39

Explain Air Classification 2

Answer 39

Class 2: Air with moderate contaminent concentration, mild senosory irritation

Question 40

Explain Air Classification 3

Answer 40

Class 3: Air with significant contaminant concentration, sensory-irritation intensity, ofensive odor

Question 41

Explain Air Classification 4

Answer 41

Class 4: Air with highly objectionable fumes/gases or potentially dangerous particles, bioaerosols, or gases and concentrations high enough to be considered harmful

Question 42

Explain Redesignation in air transfer

Answer 42

A mixture of air that has been transferred through or returned from spaces or locations with different air classes shall be redesignated with the highest classification among clsses mixed. For example, mixed return air to a common system serving both class 1 space and class 2 space is designated as Class 2 air.

Question 43

Which classes of air can or cannot be recirculated?

Answer 43

Class 1 air can be circulated anywhere, Class 2 can be recirculated to Class 2 and higher air spaces, Class 3 and 4 are not permitted to be recirculated.

Question 44

How large must ETS signage be?

Answer 44

Letter must be least 1 in. high

Question 45

IAQ Procedure

Answer 45

IAQ Procedure shall be used to determine the additional outdoor air or air cleaning necessary to achieve the concentration limits of the contaminants of concern.

Question 46

What is IAQ?

Answer 46

Indoor Air Quality

Question 47

Explain Ventilation Rate Procedure

Answer 47

prescribes the quantity of outdoor air that must be delivered to each zone, based on the expected use of that zone, and then prescribes how to calculate the outdoor airflow needed at the system-level intake. Vbz = (Rp · Pz) + (Ra · Az )

Question 48

Explain IAQ Procedure

Answer 48

IAQ Procedure is the same as the Ventilation Rate Procedure

Question 49

What must be implemented when a building is located in an area exceeding 10 micrometers (PM10)

Answer 49

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