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Ndpx24 > Section 5 - CH.13 > Flashcards

Section 5 - CH.13 Flashcards

1
Q

What is all air systems?

A

All air systems cool or heat spaces by conditioned air alone.
Heat is transported to the space with supply and return air ducts

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2
Q

What is VAV?

A

Variable Air Volume
Placed above ceiling, varies the quantity of air
One duct leads in and or several out
Are attached to registers mounted in the ceiling

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3
Q

What variation systems are used for commercial buildings?

A

Variable air volume
High velocity volume with reheat
Multi one systems

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4
Q

What component do variation systems require to run?

A

Supply air ductwork
Registers
Return air grilles

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5
Q

What is registers?

A

Connected to the supply air ductwork and can be adjusted to control direction of air flow and the volume of air coming through them

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6
Q

What is plenum?

A

The space between the suspended ceiling and the structural floor above

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7
Q

What is supply air registers?

A

Often connected to the main ductwork with flexible ducting, which allows for adjustability if in conflict

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8
Q

What is all water heating system?

A

Uses convector (coil) in each space through which hot water is circulated

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9
Q

What is terminal reheat system?

A

Combination systems that use ductwork for supplying fresh air but use water to heat or cool the air before it is introduced to conditioned space
Contains hot water coil that provides additional heat to the air stream

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10
Q

What is all water system?

A

Use all water for heating and separate duct system for ventilation and cooling

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11
Q

Where does small ducts and plumbing pipes typically run in residential construction ?

A

Within walls and floor joists
Below the floor joists and dropped ceiling for horizontal ducts

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12
Q

Where does horizontal ducts normally run in commercial construction?

A

In the plenum

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13
Q

Where does vertical ducts normally run in commercial construction?

A

Chase

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14
Q

What is chase?

A

Enclosed vertical space used only to accommodate ducts or pipes

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15
Q

What is mixing box?

A

Adjusts quantity or temperature of air going into a space from the main air supply line
Reduces the velocity of air
Attenuates noise

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16
Q

What is dual duct system?

A

Mixing box actually mixes cool and hot air coming into it from two separate ducts and distributes the mixed air to ducts serving individual rooms or spaces

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17
Q

What are the range of sizes of mixing box?

A

Range from 6-18 inches high, 24-60 inch long x 14-60 wide

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18
Q

Is mixing box easy to move?

A

Mixing boxes are often expensive and difficult to move

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19
Q

What should be verified before locating light fixtures and other recessed ceiling items?

A

Sizes and locations of ductwork ,mixing boxes and piping

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20
Q

What is access flooring?

A

False floor of individual panels raised above structural floor with pedestals to accommodate electrical, communication, and computer wiring, hvac ductwork

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21
Q

What is chase wall consists of?

A

Two runs of stud separated by several inches, exact dimension determined by largest pipe or duct that has to be concealed

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22
Q

What is toilet carrier?

A

Steel framework that is bolted to the floor inside a pipe chase and carries the weight of wall-hung toilets

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23
Q

In commercial construction, where plenum is used as a return air space, what does bldg code prohibit?

A

Use of combustible materials such as wood or exposed wire within the space

24
Q

What is allowed in plenum for commercial construction?

A

Plenum rated divider must be installed to limit the spread of fire and smoke horizontally

25
Q

Sprinkler and plumbing piping are usually located below the ductwork

A

4-6”

26
Q

Lowest layer of plenum space is used for recessed luminaires - what are heights of fixtures?

A

For compact fluorescent downlights - (9-12”)
For standard fluorescent fixtures - (4-5”)

27
Q

What is the depth of suspended ceiling itself?

A

2”

28
Q

What is access doors?

A

Typically small steel doors with frames that are opened by using a thumb turn or a key

29
Q

How tall are thermostats normally located?

A

48” above floor
ADA - 44” above floor
Should be coordinated with light switches and other

30
Q

In commercial construction there should be at least ___inch between the glass and any window covering to avoid excessive heat build up

A

2 inches

31
Q

What is slot air diffuser ?

A

It can be used when the appearance of the air distribution device needs to be minimized or when the available space does not allow a square diffuser

32
Q

What is Romex?

A

Trade name for nonmetallic sheathed cable that consists of two or more plastic-insulated conductors and ground wire surrounded by a moisture-resistant plastic jacket .
Used in wood stud residential building and buildings not three floors

33
Q

What is Flexible Metal-Clad Cable?

A

AC (Armored Cable)
Trade name is BX (or Flex)-common name
Consists of two or more plastic-insulated conductors encased in a continuous spiral wound strip of steel tape
Used in remodeling -it can be pulled through existing spaces within a bldg
Used to connect commercial light fixtures to be relocated in suspended acoustical ceiling

34
Q

What is under-carpet wiring?

A

Thin, flat, protected wire that can be laid under carpet without protruding
Must be used with carpet tiles

35
Q

What must be placed in metal conduit for commercial construction and large multi family residential construction?

A

Individual plastic insulated conductors

36
Q

What is trap (in plumbing)?

A

Designed to catch and hold a quantity of water to provide a seal that prevents gases from the sewage system from entering the building

37
Q

What is vents?

A

Pipes connected to the drainage system at various locations, open to outside air
Allow built up sewage gases to escape
Alllow pressure in the system to equalize so discharging waste does not create siphon that would drain water out of traps

38
Q

What is junction boxes?

A

Steel or approved plastic boxes to which the conduit or other cable system is attached
Required where light fixtures are connected to the electrical system

39
Q

What is the distance required for outlets in residential construction?

A

Outlets must be spaced no farther than 12 ft. Apart

40
Q

What is dedicated circuits?

A

Special power outlets placed on their own circuit to prevent various types of electrical interference from disturbing sensitive electrical equipment
For special equipment like electric range, clothes dryers, large copy machines

41
Q

What is grounding ?

A

Separate wire electrical system prevent dangerous shock if someone touches an appliance with water etc.

42
Q

What is GFCIs?

A

Ground Fault Circuit Interruptors
Same as GFIs (Ground Fault Interruptors)
Devices that detect small current leaks and disconnect the power to the circuit or appliance
Required in bathrooms, garages, outdoors, crawl spaces, countertop at kitchen
Within 6 ft of the outside edge of a wet bar

43
Q

What is AFCI?

A

Arc-Fault Circuit Interruptors
Provide protection from the effects of arc faults by recognizing characteristics unique to arcing and functioning to de-energize the circuit when this type of fault is detected
Required in bedroom branch circuits
Designed to address fire hazards
Also required to serve lighting , placed in the breaker box

44
Q

What is soil stack?

A

Stack carries human waste from toilets

45
Q

What is waste stack?

A

Stack carries wastes other than human waste

46
Q

What is stack vent?

A

Vent connecting to a soil or waste stack above the highest fixture in the system
Extends through the roof

47
Q

What is vent stack?

A

Used in multistory buildings
Separate pipe is used for venting
Either extends through the roof or connects with stack vent above the highest fixture

48
Q

Drain must be sloped minimum of _____ in/ft for pipes larger than ____ in

A

1/4 in/ft or 1/8 in/ft for 3 inch pipes

49
Q

Soil stack from toilets require _____diameter pipes

A

4 inch , an actual outside diameter

50
Q

What are three major objectives that fire protection and life safety addresses?

A

The protection of life
The protection of property
Restoration and continued use of building after a fire

51
Q

Fire protection in buildings accomplished by:

A

Preventing fires
Early fire detection and alarm
Providing for quick exiting of bldg occupants
Containing fire
Suppressing fire

52
Q

How is fire containment achieved ?

A

Building materials, compartmentation and smoke control

53
Q

How is fire suppression achieved ?

A

Fire detection and alarms, sprinkler systems, standpipes

54
Q

What is compartmentation?

A

Contain a fire and limit its spread, to allow occupants to escape and to protect bldg that are not subject to fire

55
Q

For smoke control, what compartmentation methods are used to contain the spread of smoke?

A

Fire dampers, gaskets on fire doors, automatic closing fire doors seal openings in fire walls

56
Q

What are four basic types of fire detection devices?

A

Ionization detector
Photoelectric detector
Rise-of-temperature detector
Flame detector

57
Q

What is ionization detector ?

A

Responds to combustion- ionized particles rather than smoke
Not appropriate where fire may produce a lot of smoke
Detects few particles- considered early warning detectors

Ndpx24 (5 decks)

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