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Sheet Metal First Year > Residential Hvac Components (110104f) > Flashcards

Residential Hvac Components (110104f) Flashcards

1
Q

What’s the max ratio of duct?

A

4 to 1

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2
Q

List all the parts required for a branch run?

A

Duct takeoffs, piping and boots (pipe to diffuser transitions)

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3
Q

What are the three most common boots for hvac?

A

End boot, u boot, right angle boot

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4
Q

Why are stack ducts used?

A

To transition from round to rectangular and back again
Never in real world you would use oval pipe and 2 round to oval 90’s

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5
Q

What encases the under slab heating duct?

A

Round duct encased in concrete

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6
Q

Which way does the under slab heating duct slope to the furnace

A

Back to the furnace

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7
Q

What are two types of vent connector that can be used?

A

Single wall
Double wall

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8
Q

What does pto stand for?

A

Plenum take off

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9
Q

What is used to hang duct from floor joists?

A

Duct hangers

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10
Q

Residential pipe elbows are equivalent to how many feet of pipe?

A

10 feet, adding 1 elbow equals 10 feet of pipe.

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11
Q

Roof jacks used on dryer vents are not equipped with?

A

Bird screens

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12
Q

The combustion air termination is used to?

A

Keep cold air from dropping into the furnace room

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13
Q

A 14 inch by 8 inch return air grill covers?

A

A 14 inch by 8 inch hole

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14
Q

When a return air branch run is finished on the bottom with drywall ceiling, the bottom part of the branch run is finished with?

A

Drywall

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15
Q

What is a reducer or transition

A

A reducer or transition changes the size of the duct smoothly.

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16
Q

What are different types of takeoffs?

A

Top , side , two way, saddle, universal

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17
Q

What is joist liner?

A

A product used to finish closing off the joist space for return air.

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18
Q

Where does the drop duct connect?

A

The furnace through the filter rack

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19
Q

What is the heart of the hvac system?

A

Air recirculation fan

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20
Q

Furnaces require air to fuel the fire inside of them this is called?

A

Combustion air

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21
Q

Name 4 things that can cause dynamic loss in an airstream?

A

Material duct is constructed from
Shape of duct
Changes in direction
Changes in cross sectional area

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22
Q

Dynamic losses on flexible duct are approximately how many times great per foot as in smooth duct?

A

10

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23
Q

You should always install 2 elbows together (back to back) true or false?

A

False

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24
Q

What is exfiltration?

A

The uncontrolled leakage of air from a building

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25
Q

What is return air?

A

Air from the occupied space returned to furnace

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26
Q

What is joist lining made from?

A

Metal, thermopan, plastic or drywall

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27
Q

Where does a filter rack install?

A

Between furnace and drop duct

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28
Q

Return air duct is mounted tight to what?

A

Floor joists

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29
Q

Underslab heating uses what kind of duct?

A

Round duct that is encased in concrete

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30
Q

What is the standard for (BH) venting?

A

ULC S636

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31
Q

The combustion process requires what from the air for combustion?

A

Oxygen

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32
Q

What is an intake hood for?

A

To bring combustion air into the building

33
Q

What does the return air system consist of?

A

All the parts from the return air grilles in the room right back to the furnace

34
Q

If heat is supplied by burning a fuel in the heat exchanger it is called?

A

A furnace

35
Q

If hot water supplies the heat it is called?

A

A fan coil unit

36
Q

Where should supply outlets (boots) be placed in a room?

A

At the point of greatest heat loss or gain.
Under windows or besides doors

37
Q

What is ratio for pto front to back?

A

Back towards furnace is 1.5 times the other side towards the duct

38
Q

What is recommended length of the offset fitting?

A

2 times the amount of the offest

39
Q

Pipe supports are required at?

A

Every joint or elbow

40
Q

What is a frost wall?

A

A 2x4 wall insulated wall built on the inside of the concrete basement wall

41
Q

B vent piping for venting is rated to withstand how high of a temperature?

A

470 Fahrenheit
243 Celsius

42
Q

Exterior terminations are called what?

A

Hoods and roof jacks

43
Q

Exhaust hoods require what?

A

A flap
Fresh air hoods do not

44
Q

What is the difference between B and BW vent

A

BW vent is oval

45
Q

What venting can be used for oil burning appliances?

A

A vent and L vent

46
Q

What is the most common duct installed today?

A

Extended plenum or reducing extending plenum

47
Q

What shape of duct is best? And what other kinds are used also?

A

Round duct is best
Square duct is next best after round
Rectangular duct is next best after square

48
Q

What is the main purpose of a plenum?

A

To calm the turbulent air that is coming out of the furnace before being distributed

49
Q

What is needed to order a plenum?

A

Length
Height
Width

50
Q

What is the standard practice dictated for a pto?

A

The inlet of the pto is 1.5x the cross sectional area of the duct it is being attached to

51
Q

How is a pto ordered?

A

Duct width x duct height x rise also with a 2 to 4 inch rise or flat top in some cases

52
Q

What are duct hangers made from in the field?

A

Drive cleats

53
Q

How can a change in airflow direction be achieved?

A

With the use of fittings like elbows, offsets, or branch fittings

54
Q

What is a short way elbow?

A

The elbow that has a short dimension on the cheeks

55
Q

What is a long way elbow?

A

The elbow has the long dimension on the cheek

56
Q

What is a change elbow?

A

If an elbow has a change in size from one end to the other it is called a change elbow

57
Q

What are offsets and risers?

A

Offsets move from side to side
Risers move up and down

58
Q

How do you know what size to make the cheek? (8x30)

A

The first number is the size of the cheek therefore 8” cheek

59
Q

What is L vent constructed from?

A

Galvanized outer, airgap space, stainless steel inner liner

60
Q

Where are end caps used?

A

At the end of every duct run

61
Q

What is BH venting?

A

BH vent is a special venting stainless or plastic used for condensing furnaces

62
Q

Dynamic losses occur in both Rectangular and round duct?

A

True

63
Q

What is modern fresh air ducting?

A

Flexible insulated ducting

64
Q

How are bathfans most commonly vented? And how else are they vented?

A

-Insulated flex pipe
-Solid metal pipe when close to exterior wall must be insulated

65
Q

What is a kitchen fan called?

A

Range vent

66
Q

What’s the difference between class A and super class A venting?

A

Super A has 2 inch of insulation between the inner liner and outer casing. This allows the chimney to withstand 1200 f continuously and up to 2100 f for 10 minutes.

67
Q

Should B vent material be cut or modified?

A

No

68
Q

If basement is unfinished where must joist liner be installed?

A

On the bottom of the joist return air is in with block ends

69
Q

Why do return air frames have a 1/2 flange?

A

To help dry wall installers to cut a neat hole in drywall of the correct size

70
Q

What kind of pipe is used in residential installs?

A

Snap lock most common sizes are 4”, 5” and 6” other sizes used are 8” and 10” sold in 5’ lengths

71
Q

What is B vent made of?

A

Inner aluminum liner
Airspace
Outer galvaluminum (470 degrees F) 243 degrees C

72
Q

FOT meaning?

A

Flat on top

73
Q

What is a branch run?

A

Terminations from the main duct to deliver air to the different terminations

74
Q

When venting an appliance that burns natural gas or propane what venting is used?

A

B vent

75
Q

What is the best style of duct for less dynamic loss?

A

Round duct

76
Q

Most commonly used duct in residential installs?

A

Rectangular to save headroom in a basement sold in 5’ lengths

77
Q

What pipe is used on duct runs for underslab heating?

A

Spiral pipe

78
Q

When is make up air possibly required?

A

When extra exhaust fans are installed

Sheet Metal First Year (31 decks)

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