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Sheet Metal > Finals > Flashcards

Finals Flashcards

1
Q

which direction does heat always travel

A

warm to cold

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2
Q

how is a principal ventilation fan sized

A

number of bedrooms

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3
Q

define dew point

A

temperature at which moisture in the air begins to condense

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4
Q

what happens when air is heated

A

relative humidity decreases

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5
Q

what is not a type of hrv heat exchanger core

A

Pannel

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6
Q

why do we set a lower relative humidity in our home when the temperature drops

A

to prevent condensation

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7
Q

how do we measure intensity of heat

A

degrees measured by a thermometer

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8
Q

absolute zero is -273c, what else is it?

A

0 degrees kelvin

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9
Q

what method of heat transfer uses natural motion of a fluid medium

A

convection

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10
Q

one British thermal unit will raise?

A

55 cubic feet of air one degree farenheight

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11
Q

when does heat stop flowing between objects

A

when they reach the same temperature

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12
Q

what method of heat transfer requires physical contact between two bodies to occur

A

conduction

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13
Q

what is not a function of a make up air system

A

Control temperature of a home

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14
Q

a grain is a measure of

A

weight

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15
Q

what effects does low humidity have on people

A

sore throats and dry skin

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16
Q

sensible heat is

A

The amount of heat required to produce a change in temperature of a substance, but not a change of state.

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17
Q

Heat transfer by Radiation can be described as

A

The transfer of heat by energy waves similar to light waves.

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18
Q

hrvs can recover what percent of heat loss

A

85

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19
Q

what was the source of ventilation in the 70s

A

leakage

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20
Q

how many cfms for a master bedroom

A

20

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21
Q

what is heat

A

energy

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22
Q

how do we measure the volume of heat

A

btus

23
Q

what is not a type of furnace

A

side boy

24
Q

what are the 2 most common heating fuels in Alberta

A

natural gas and propane

25
Q

what separates the air that circulates in a house from the products of combustion

A

heat exchanger

26
Q

what is the efficiency of a furnace that has 15% of the heat it produces going up the chimney

A

85 perecent

27
Q

what is the purpose of an inducer motor

A

to regulate combustion air

28
Q

a furnace that condenses water vapour in its flue gases is known as what type of furnace

A

high efficiency

29
Q

why do we filter the air upstream of the furnace

A

to protect the equiptmentb

30
Q

what is the recommended humidity in the home

A

30-55 percent

31
Q

a humidistat is activated by what

A

moisture

32
Q

what does cfm measure

A

amount of air a fan will exhaust or supply in one minute

33
Q

why do we reduce our duct in an extended plenum system

A

to keep pressure levels at what is required

34
Q

what was the method of supplying combustion air for appliances prior to 1976

A

leakage

35
Q

Special fresh air ventilation fittings must be used to connect the fresh air duct to the return trunk duct.

A

no

36
Q

the combustion air termination is used to…

A

keep cold air from dropping into the furnace room

37
Q

Both factory built chimneys and vents have a system of parts that are _____ by a recognized testing agency.

A

certified

38
Q

Installations requiring you to run forced air heating under the concrete slab are known as:

A

under slab heating

39
Q

roofjacks used on dryer vents are available without bird screens

A

true

40
Q

the fitting used to connect the return air branch to the main duct is

A

nothing

41
Q

The material used for venting of the fan to the outside must be metal duct with insulation and a vapour barrier, such as foilback insulation.

A

false

42
Q

Furnaces require air to fuel the fire inside of them. This is called _____ air.

A

combustion

43
Q

The entire underslab ducting system must slope (back to/level/away from) the furnace.

A

back to

44
Q

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

A

drywall

45
Q

_____ is the uncontrolled leakage of air from a building.

A

exfiltration

46
Q

Type L-vent construction consists of:

A

an outer casing of Galvalume® / airspace / inner liner of stainless steel.

47
Q

The ductwork coming off the plenum for underground heating installations will be round for strength and to make it easier to seal against moisture in the ground.

A

true

48
Q

a 14x8 return air grill covers a 14x8 hole

A

true

49
Q

what’s the heart of the hvac system

A

air recirculation fan

50
Q

The air is ______ from the central heating or cooling unit by the supply air system.

A

distributed

51
Q

he return air part of an HVAC system consists of the parts to bring air back from the _____ to the furnace.

A

occupied space

52
Q

Rectangular duct takeoffs include all of the following except:

A

saddle takeoffs

53
Q

duct ratio should not exceed

A

4 to 1

Sheet Metal (1 decks)

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