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First Year Sheetmetal > Residential HVAC Components (110104f) > Flashcards

Residential HVAC Components (110104f) Flashcards

1
Q

When should you use a longer duct run?

A

you should avoid it as longer runs lose air flow shorter runs are best

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2
Q

What is the main purpose of the plenum?

A

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

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3
Q

what is needed to order a plenum?

A

Length x height x width

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4
Q

What does PTO stand for?

A

Plenum Take Off

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5
Q

What is the standard trade practice dictated for the PTO?

A

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

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6
Q

How is a standard PTO ordered and how do they come?

A

Duct width x duct Hight x rise required they come as straight on top or with a 2-4 inch rise.

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7
Q

what is common residential duct size?

A

8” that comes in 8’ or 5’ lengths

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8
Q

what is the ratio between the with and depth of a duct?

A

4:1

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9
Q

what are duct hangers constructed from in the field?

A

Drive cleats

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10
Q

how can a change in airflow direction be achieved?

A

with the use of fittings like elbows offsets or branch fittings

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11
Q

what is a short way elbow?

A

the elbow has the short dimension on the cheeks

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12
Q

What is a long way elbow?

A

The elbow has the long dimension on the cheek

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13
Q

What is a change elbow fitting?

A

the fitting has two different opening sizes the changes occur on the cheeks

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14
Q

what are offsets and risers?

A

offsets move from side to side
risers move up and down

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15
Q

how do you know what size to make the cheek? (8” x 30”)

A

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

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16
Q

what is the minimum that the offset has to be?

A

two times the offset

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17
Q

why are transitions/ reducers used?

A

to change the size of the duct smoothly

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18
Q

F1S meaning?

A

Flat one side

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19
Q

C with a line through it is what?

A

on center or centerline

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20
Q

FOT meaning?

A

Flat On Top

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21
Q

were are end caps used?

A

at the end of every duct run

22
Q

What is a branch run?

A

they are terminations of the main trunk they supply air to the different terminations

23
Q

What are some common take offs?

A

Top take off
Side take off
Two way take off
Saddle take off
Universal take off

24
Q

what is the common type of pipe for residential?

A

snap lock pipe it is made in 5’ lengths

25
Q

what is a round-end cap called?

A

a plug

26
Q

When is a volume damper required?

A

at the end of each branch run and is placed in line close to the truck line or as a diffuser

27
Q

Were is pipe support required?

A

at every joint and elbow

28
Q

one pipe elbow is equivalent to how many feet of pipe?

A

10’

29
Q

what is a right-angle boot called?

A

RAB

30
Q

what are some common Boots?

A

End boot
Universal boot
Right angle boot
Kickboot

31
Q

what are common boot sizes?

A

3” x 10”
4” x 10”

32
Q

what are stack ducts for?

A

transition from round to square and back helps for when ducts have to go up in walls

33
Q

What is the combustion air termination used for?

A

to isolate the combustion air and keep it from dumping cold air into the furnace room

34
Q

what is forced air that runs under the concrete called?

A

Under slab heating

35
Q

what do roof jacks on dryer vents not have that fresh air do?

A

Bird screen

36
Q

In what way must under slab branches flow?

A

back toward the furnace

37
Q

what is L-vent constructed from?

A

galvanized outer, airgap space, stainless steel inner liner

38
Q

what type of ducting is used for under slab and why?

A

round spiral for added strength

39
Q

what is the heart of the HVAC system?

A

Recirculation fan

40
Q

what type of take of is different for round pipe?

A

Saddle take offs are for pipe only

41
Q

what causes dynamic air loss?

A

How the duct is constructed
shape of the duct
changes in direction
changes in cross-sectional areas
use of fittings

42
Q

How many feet is equivalent in the use of flexible pipe?

A

10’

43
Q

does dynamic loss occur in square and round duct?

A

yes

44
Q

how are return air grills sized?

A

by the hole they cover

45
Q

what connects the return air trunk back to the furnace?

A

Drop duct

46
Q

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

A

they use b-vent

47
Q

what is b-vent made of?

A

inner aluminum liner, airspace, outer galvaluminum (470 degrees F) 243 degrees C

48
Q

what is BW-Vent

A

it has the same application as B-vent but is oval

49
Q

what is BH venting?

A

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

50
Q

what is the best style for less dynamic loss?

A

round spiral

51
Q

should two elbows be put back to back?

A

they should not

52
Q

where is fresh air connected in the HVAC system?

A

the return air at a minimum 10’ away from the heat exchanger

First Year Sheetmetal (20 decks)

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