res installs

Question 1

what is the fire triangle

Answer 1

fuel
heat
oxygen

Question 2

_____________ is added to gas to smell and identify gas?

Answer 2

mercaptan

Question 3

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

Answer 3

one

Question 4

what is the purpouse of a gas orifice

Answer 4

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

Question 5

ignition temp for natural gas is?

Answer 5

between 1230-1360

Question 6

propane ignition is?

Answer 6

920-1020 f

Question 7

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

Answer 7

1314

Question 8

at what tempurature will the furmace blower shut down at

Answer 8

90°f

Question 9

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

Answer 9

78% efficentcy and temp of vent is 450°f

Question 10

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

Answer 10

78% efficientcy and vent temp 350°f

Question 11

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

Answer 11

88% efficient and vent temp is 110°f

Question 12

what is the proper name for pvc

Answer 12

polyvinyl chloride

Question 13

what are the 4 styles of furnaces?

Answer 13

1. upflow
2. counter flow
3. horizontal
4. low boy

Question 14

what dose CFM stand for?

Answer 14

cubic feet per minute ( volume of air)

Question 15

what dose fpm stand for

Answer 15

feet per minute (velocity)

Question 16

what is not required in a solid fuel furnace?

Answer 16

gas valve

Question 17

what is the heating value of natural gas

Answer 17

1000 btu/ft3

Question 18

what is the heating value of propane

Answer 18

2500 btu/ft3

Question 19

what are high efficiency furnaces also known as ?

Answer 19

condensing furnaces

Question 20

what is the heart of a hvac system?

Answer 20

air recirculation fan

Question 21

the ratio between duct should should never exceed_______

Answer 21

4:1 ratio

Question 22

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

Answer 22

10 feet

Question 23

the under slab duct system may be secured with______?

Answer 23

slab stakes

Question 24

what is the purpouse of slab steaks

Answer 24

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

Question 25

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

Answer 25

back to the furnace

Question 26

system 636 is also known as

Answer 26

bh vent

Question 27

what is galvalume?

Answer 27

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

Question 28

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

Answer 28

insulation and a plastic vapour barrier

Question 29

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

Answer 29

to keep cold air from dropping into the furnace room excessively

Question 30

what is exfiltration

Answer 30

exfiltration is the uncontrolled leakage of air from a building

Question 31

what causes dynamic loss

Answer 31

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

Question 32

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

Answer 32

10 times

Question 33

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

Answer 33

round duct

Question 34

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

Answer 34

combustion air

Question 35

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

Answer 35

certified

Question 36

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

Answer 36

false

Question 37

oh&s covers who?

Answer 37

employers and employess

Question 38

all furnaces installed must ber certified by whom

Answer 38

csa

Question 39

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

Answer 39

a set of blue prints

Question 40

what dose the heat loss calculation determine whrn completed

Answer 40

size of furnace required

Question 41

what is the purpose of a fire stop?

Answer 41

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

Question 42

what is the gas code we follow

Answer 42

b149.1

Question 43

supply outlets is what minnim clearence from the ground

Answer 43

12 inches

Question 44

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

Answer 44

airborn greases and oils

Question 45

dryer runs should always be _________ and never _________?

Answer 45

taped and never screwed

Question 46

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

Answer 46

1. 10 feet | 2. 3 feet

Question 47

the clearence for the front of the furnace should be ?

Answer 47

24 inches or 2 feet

Question 48

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

Answer 48

SMACNA

Question 49

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

Answer 49

the installer

Question 50

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

Answer 50

10 feet

Question 51

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

Answer 51

1 8th

Question 52

typicaly you reduce every___________ cfm

Answer 52

400