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SAIT 1st year residential installs sheet metal > res installs > Flashcards

res installs Flashcards

1
Q

what is the fire triangle

A

fuel
heat
oxygen

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2
Q

_____________ is added to gas to smell and identify gas?

A

mercaptan

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3
Q

you need 10 cubic feet of air to burn _____ cubic foot of gas?

A

one

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4
Q

what is the purpouse of a gas orifice

A

the gas orifice is the fitting used to shoot gas into the burner

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5
Q

ignition temp for natural gas is?

A

between 1230-1360

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6
Q

propane ignition is?

A

920-1020 f

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7
Q

how many btu is required to take a solid to a vapour?

A

1314

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8
Q

at what tempurature will the furmace blower shut down at

A

90°f

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9
Q

low efficent furnaces is up to ___ efficent and vent temp is _____?

A

78% efficentcy and temp of vent is 450°f

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10
Q

mid efficent furnaces has a efficientcy of _____ and a vent temp off_____?

A

78% efficientcy and vent temp 350°f

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11
Q

high efficiency furnace is ________ efficient and vent temp is _____?

A

88% efficient and vent temp is 110°f

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12
Q

what is the proper name for pvc

A

polyvinyl chloride

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13
Q

what are the 4 styles of furnaces?

A
  1. upflow
  2. counter flow
  3. horizontal
  4. low boy
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14
Q

what dose CFM stand for?

A

cubic feet per minute ( volume of air)

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15
Q

what dose fpm stand for

A

feet per minute (velocity)

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16
Q

what is not required in a solid fuel furnace?

A

gas valve

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17
Q

what is the heating value of natural gas

A

1000 btu/ft3

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18
Q

what is the heating value of propane

A

2500 btu/ft3

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19
Q

what are high efficiency furnaces also known as ?

A

condensing furnaces

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20
Q

what is the heart of a hvac system?

A

air recirculation fan

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21
Q

the ratio between duct should should never exceed_______

A

4:1 ratio

22
Q

how many feet of pipe dose a elbow add to a run?

A

10 feet

23
Q

the under slab duct system may be secured with______?

A

slab stakes

24
Q

what is the purpouse of slab steaks

A

to keep the duct of the bottom of the trench and is to keep the duct from floating up when concrete is poured

25
Q

in a underslab ducting system which way should youre duct be slopped

A

back to the furnace

26
Q

system 636 is also known as

A

bh vent

27
Q

what is galvalume?

A

galvalume is steel coated with 55% aluminium and 45% zinc

28
Q

a flexible insulated duct is covered with __________ and a __________ ?

A

insulation and a plastic vapour barrier

29
Q

whaf is the purpouse of putting a termination kit at the end of a combustion air duct?

A

to keep cold air from dropping into the furnace room excessively

30
Q

what is exfiltration

A

exfiltration is the uncontrolled leakage of air from a building

31
Q

what causes dynamic loss

A

type of material
shape of duct
changes in direction
changes in cross sectional area

32
Q

dynamic losses are approxmatley ___ times as much per foot travling through flexible duct as it dose in smooth duct

A

10 times

33
Q

what kind of duct is the most efficient shape and should be chosen when ever possible

A

round duct

34
Q

furnaces requires are to fuel the fire inside of them. this is called _____________

A

combustion air

35
Q

both factory built chimneys and vents have a system of parts that are ____________ by a recognized testing agency

A

certified

36
Q

you should always install 2 elbows back to back… true or false

A

false

37
Q

oh&s covers who?

A

employers and employess

38
Q

all furnaces installed must ber certified by whom

A

csa

39
Q

what is required to do a heat loss calculation on a building

A

a set of blue prints

40
Q

what dose the heat loss calculation determine whrn completed

A

size of furnace required

41
Q

what is the purpose of a fire stop?

A

to stop fire from entering the chase and to maintain the clearance

42
Q

what is the gas code we follow

A

b149.1

43
Q

supply outlets is what minnim clearence from the ground

A

12 inches

44
Q

in addition to moisture what else dose the range hood remove?

A

airborn greases and oils

45
Q

dryer runs should always be _________ and never _________?

A

taped and never screwed

46
Q

how many feet dose a mechanical hood be installed from a gas regulator

and how many feet can a natural draft intake or appliance exhaust hood be installed from a gas reg

A
  1. 10 feet

2. 3 feet

47
Q

the clearence for the front of the furnace should be ?

A

24 inches or 2 feet

48
Q

which agency conducts tests and writes standards specifically for the hvac industry

A

SMACNA

49
Q

whose responsibility is it to ensure the job is done properly abd to the applicable code

A

the installer

50
Q

how far from there furnace inlet dose the fresh air connection be installed

A

10 feet

51
Q

if a metal joist liner is installed you should ____ gap to reduce noise

A

1 8th

52
Q

typicaly you reduce every___________ cfm

A

400

SAIT 1st year residential installs sheet metal (1 decks)

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