22. Flue Construction 1

• Flues
• Higher Education (degree)

Flue Construction 1

Which chemical present in the products of combustion makes it necessary the have materials that are resistant to mild acid

1. Nitrogen
2. Water
3. CO2
4. CO

Above what size is an approved terminal not required

1. 170mm
2. 100mm
3. 50mm
4. 25mm

Why must flue liners be fully sealed at the bottom?

1. It looks neat
2. The liner is porous and leaks into the chimney
3. It helps flue flow
4. It retains heat

Why do external flues require lining at shorter lengths than internal flues

1. The effect of sunlight
2. They tend to be colder and less efficient
3. They tend to be warmer and less efficient
4. It is more expensive to line external flues

What is the minimum csa for a circular flue

1. 12000mm
2. 16500mm
3. 125mm
4. 1500mm

What is the minimum cross sectional area of a rectangular pre cast flue block made in 1995

1. 16500mm
2. 125mm
3. 170mm
4. 100mm

You attend a block of flats to repair a boiler. On the way in you notice that there are labelled ventilation grilles at groung floor level.
What type of ventilation system would you expect?

1. SE Duct
2. U Duct

Twin-walled flues using only air as an insulator and fitted to the exterior of a house must not exceed what length

1. 1m
2. 3m
3. 5m
4. This is not allowed

When placing a vertical flue which requires a bend, the law requires that the flue must run straight for the first

1. 600mm
2. 50mm
3. 120mm
4. 170mm

Flues that cannot be placed on external walls and must be run through attic areas are generally called

1. Open Flue
2. Room Sealed
3. Horizontal Flue
4. Vertex Flue