CCP CCP Chimney Draft & Combustion Principles

Question 1

What is the primary driving force behind chimney draft?

Accepted Answer

Temperature differential between flue gases and outside air

Answer

Moisture content of the fuel

Answer

Chimney height above ground

Answer

Barometric pressure at sea level

Question 2

What unit is typically used to measure chimney draft pressure?

Accepted Answer

Pascals or inches of water column

Answer

Pounds per square inch (PSI)

Answer

Decibels (dB)

Answer

BTUs per hour

Question 3

Which condition is most likely to cause a chimney to backdraft?

Accepted Answer

Negative indoor air pressure relative to outside

Answer

Excessive flue gas temperature

Answer

Oversized chimney flue

Answer

High outdoor wind speed

Question 4

What is the minimum natural draft typically required for proper residential appliance operation?

Accepted Answer

0.01 to 0.05 inches of water column

Answer

0.5 to 1.0 inches of water column

Answer

2.0 to 5.0 inches of water column

Answer

10 to 15 inches of water column

Question 5

How does chimney height affect draft performance?

Accepted Answer

Taller chimneys generally produce stronger draft

Answer

Shorter chimneys always produce better draft

Answer

Height has no effect on draft

Answer

Taller chimneys only improve draft in winter

Question 6

What effect does a cold chimney flue have on initial draft when an appliance is first lit?

Accepted Answer

It reduces draft until the flue warms up

Answer

It immediately increases draft

Answer

It has no effect on draft

Answer

It permanently damages the appliance