Deck 13: Vents for Category I Appliances

Question 1

Which of the following is a pressure difference that causes gases or air to flow through a chimney, vent, flue, or appliance?

A)draft
B)dilution air
C)natural draft
D)mechanical draft

Answer 1

A

Question 2

Which category of appliances are positive vent static pressure with a vent gas temperature that can cause excessive condensate production in the vent?

A)Category I
B)Category II
C)Category III
D)Category IV

Answer 2

D

Question 3

Which of the following is the conduit or passageway that connects a fuel-gas burning appliance to a vent or chimney?

A)single wall chimney
B)single wall vent connector
C)vent connector
D)draft hood

Answer 3

C

Question 4

For Category I appliances, what is the first item in the venting system that is installed?

A)vent terminal
B)draft hood
C)vent connector
D)automatic vent damper

Question 5

Which of the following is room air that mixes with flue gas at the draft diverter?

A)draft
B)dilution air
C)natural draft
D)mechanical draft

Question 6

Which of the following occurs when the flue gases are pushed back into the combustion chamber?

A)reverse draft
B)dilution air
C)natural draft
D)mechanical draft

Question 7

Which of the following are usually made of galvanized steel not less than 0.0304" in thickness?

A)single wall chimneys
B)single wall vent connectors
C)Type B vents
D)draft hoods

Question 8

Which of the following is developed by a fan or blower installed in the vent path?

A)draft
B)dilution air
C)natural draft
D)mechanical draft

Question 9

Which combustion control closes as soon as the firing cycle is complete and is meant to minimize the loss of residual heat up a chimney?

A)automatic vent damper
B)larger burner
C)electrical pilot igniter
D)none of the above

Question 10

When an appliance is _____________ vented, fresh air is brought straight to the unit through a pipe that runs from outside the building to the combustion chamber of the appliance.

A)direct
B)power
C)mechanical
D)induced

Question 11

Which of the following is produced by differences in density between the gases within the vent conduit and the surrounding atmosphere?

A)draft
B)dilution air
C)natural draft
D)mechanical draft

Question 12

What type of air is supplied through the draft hood and helps to maintain a more constant draft pressure and to lower the temperature of chimney gases?

A)primary air
B)secondary air
C)exhaust air
D)dilution air

Question 13

Which category of appliances are positive vent static pressure with a vent gas temperature that avoids excessive condensate production in the vent?

A)Category I
B)Category II
C)Category III
D)Category IV

Question 14

Which of the following occurs when all of the gas is burned and no excess air is left?

A)perfect combustion
B)imperfect combustion
C)incomplete combustion
D)complete combustion

Question 15

When does secondary air combine with gas?

A)before combustion
B)during combustion
C)after combustion
D)none of the above

Question 16

Which category of appliances are nonpositive vent static pressure with a vent gas temperature that avoids excessive condensate production in the vent?

A)Category I
B)Category II
C)Category III
D)Category IV

Question 17

Which category of appliances are nonpositive vent static pressure with a vent gas temperature that can cause excessive condensate production in the vent?

A)Category I
B)Category II
C)Category III
D)Category IV

Question 18

Which of the following is a special fitting that receives the products of combustion from the appliance and admits dilution air to the stream?

A)single wall chimney
B)single wall vent connector
C)vent connector
D)draft hood

Question 19

The principal products of combustion of any hydrocarbon combustion are water vapor and ____________.

A)carbon monoxide
B)soot
C)carbon dioxide
D)nitrogen

Question 20

Which of the following are a factory-made combination of aluminum inner wall and steel outer wall with about a 3/4" space between the two walls?

A)single wall chimneys
B)single wall vent connectors
C)Type B vents
D)double wall, Type L vents

Question 21

Asbestos-cement piping is considered a hazardous material and should be removed only by properly trained and qualified individuals.

Question 22

What three things are required for combustion to take place?

Question 23

Dryer lint is not flammable.

Question 24

List at least three common chimney problems that must be checked.