Venting System

Question 1

What is the Max temperature for 316L stainless steel

Answer 1

Max temp 550* F

Question 2

annex c c.2.5 horizontal length

Answer 2

look book

Question 3

Type 316L stainless steel vent is common for what purpose / type of appliance

Answer 3

Condensing. As it is resistant to corrosion

Question 4

What is the Purpose of the vent.

Answer 4

To keep the heat inside and protect the structure outside.

Question 5

Single wall chimney liners are intended for masonry chimney to vent which category of appliances

Answer 5

Cat 2 , 3 and 4 Gas and oil fired condensing appliances

Question 6

Double wall insulation vent will require insulation to be placed over or under the bad clamp before the installation of the trim piece?

Answer 6

Over

Question 7

Low temp sealant rating - ?
High temp sealant rating ?
What is ES

Answer 7

LTS 600F
HTS 2000F
ES exterior sealant - outer sealant weather proof

Question 8

What is the horizontal grade per foot for vent ?

Answer 8

1/4” / Ft

Question 9

What is the draft status of an atmospheric appliance referred to as

Answer 9

Gravity

Question 10

What can be the results of an improperly selected, sized and/or installed venting system?

Answer 10

Efficiency loss, Appliance damage, Increased appliance maintenance, damage to breeching & stack, Production downtime, Increased operating costs.

Question 11

What is the draft source for a natural draft appliance? Explain how this draft source moves the products of combustion through the appliance and the venting.

Answer 11

Gravity is the source. It moves the products of combustion through the appliance and venting because the hot flue gases are lighter and naturally rise (buoyancy).

Question 12

Define forced draft:

Answer 12

A mechanical draft produced by a device upstream from the combustion zone of an appliance

Question 13

Define induced draft:

Answer 13

A mechanical draft produced by a device downstream from the combustion zone of an appliance

Question 14

Describe the three general variations of Burner inlet blowers and the different pressures associated with each.

Answer 14

a. Blowers which operate with enough pressure to overcome the burner alone. The combustion chamber, appliance outlet and venting will all be under negative pressure
b. Blowers which operate with enough pressure to overcome the burner and combustion chamber. The combustion chamber will be under positive pressure, appliance outlet will be neutral or negative and the appliance venting will be under negative pressure
c. Blower which operates with enough pressure to overcome the burner, combustion chamber and part or all of the venting. All parts of the system past the burner are under positive pressure

Question 15

What is the pressure upstream of the blower when it is located on the outlet of the appliance?

Answer 15

Negative

Question 16

What is the pressure downstream of the inducer blower located on the outlet of the appliance?

Answer 16

It will be positive immediately downstream but could be either negative, neutral or positive on the downstream side depending on the blower’s power and the venting system

Question 17

In a venting or chimney system with mechanical draft what two types of draft can be present and what type of pressure is associated with each?

Answer 17

Forced draft – static pressure in the venting is positive
Induced draft – static pressure is the venting is negative

Question 18

When a venting system was originally installed as a gravity system where is the best location for the blower to be located? Why?

Answer 18

A draft inducer located at the vent or chimney outlet will maintain a negative pressure in the venting. Which would be the pressure the system was originally designed for

Question 19

What must be done when a power venter is used in place of a natural draft venting system.

Answer 19

Gas flow to the main burner must be prevented in the event of power venter failure

Question 20

When must design registration take place when you are designing or modifying complex, technical, and regulated equipment in BC?

Answer 20

Before the construction and installation of the equipment

Question 21

When are parallel blade damper used?

When are opposed blade dampers used?

Answer 21

PARALLEL For open/closed operation

OPP For modulating operation

Question 22

What must be done when an automatic flue damper is installed on an appliance with a continuous pilot?

Answer 22

Must have a fixed minimum opening of 20% of the flue area and be interlocked with the burner control system so the that damper is proved fully open before ignition of main burner and The fuel supply to the appliance will be shut off in the event of failure except where the damper will fail fully open.

Question 23

What is used on flue venting guy wires to allow for vent expansion and contraction without stretching the guy wires?

Answer 23

spring loaded turnbuckle

Question 24

What Category appliance has nonpositive pressure and a temperature above 140°F (60°C)?

What Category appliance has positive pressure and a temperature below 140°F (60°C)?

What Category appliance has positive pressure and a temperature above 140°F (60°C)?

What Category appliance has nonpositive pressure and a temperature below 140°F (60°C)?

Answer 24

Category I
Category IV
Category III
Category II

Question 25

What Category appliance requires venting that is made of material that is intended to resist corrosion from condensing?

Answer 25

Category II & IV

Question 26

What Category appliance requires venting to be sealed and pressure tight?

Answer 26

Category III & IV

Question 27

What is that maximum temperature of 316L stainless venting?

Answer 27

550°F

Question 28

What temperature can high temperature silicone go up to?

Answer 28

2000°F

Question 29

A flue vent can be supported by the appliance it serves.

Answer 29

False

Question 30

What is the typical grade for horizontal flue venting?

Answer 30

1/4'' PER FOOT

Question 31

How should the flue venting be graded for a condensing type appliance when running the vent horizontally to the outdoors?

Answer 31

Towards the appliance

Question 32

To maintain the flow of condensate in a condensing appliance’s flue venting, a horizontal change in size of the venting should be done with what type of increaser?

Answer 32

Eccentric type

Question 33

When changing the size of vertical venting, it should normally be done with what type of increaser?

Answer 33

Concentric type

Question 34

What is used on flue venting guy wires to allow for vent expansion and contraction without stretching the guy wires?

Answer 34

Spring loaded turnbuckles