OFTEC Flue Systems for Oil

Question 1

What is the primary purpose of a flue system on an oil-fired appliance?

Accepted Answer

To safely discharge combustion products to the outside atmosphere

Answer

To supply fresh air to the burner

Answer

To regulate the oil flow rate

Answer

To insulate the boiler from the building

Question 2

What is the difference between a conventional flue and a balanced flue for oil appliances?

Accepted Answer

A conventional flue draws combustion air from the room; a balanced flue draws air from outside

Answer

There is no difference

Answer

A balanced flue is always vertical

Answer

A conventional flue does not have a terminal

Question 3

What is the minimum height a vertical oil flue terminal must be above a flat roof?

Accepted Answer

600mm above the roof surface within 1.5m of the terminal

Answer

100mm above the roof surface

Answer

2 metres above the roof surface

Answer

No minimum height is specified

Question 4

Why must oil flue systems have a minimum number of bends?

Accepted Answer

Each bend increases resistance to gas flow and reduces the available draught

Answer

Bends make the flue look untidy

Answer

Bends increase the cost only

Answer

Bends have no effect on flue performance

Question 5

What is the maximum horizontal run allowed for an oil flue pipe before it must rise vertically?

Accepted Answer

Generally 3 metres, with a minimum upward slope of 1 in 12

Answer

10 metres with no slope required

Answer

1 metre with no slope

Answer

No limit as long as the flue is insulated

Question 6

What type of flue is required for an oil-fired appliance installed in a bathroom or bedroom?

Accepted Answer

A room-sealed (balanced) flue system

Answer

A conventional open flue

Answer

No flue is needed in small rooms

Answer

Any type of flue is acceptable