As placement of the vertical flue is more complex and convoluted than a standard horizontal flue it is more costly.
Flue through roof space.
Vent pipes provide this air by running outside the structure of the house.
This article series describes b vent metal chimneys used for gas fired appliances.
Space between the chimney walls allows for outside air to flow freely.
In a through the brick and inner flue installation for a six inch.
Type b vents ceiling floor wall clearances b vent clearances to combustibles clearance distances for a b vent to combustible materials in floors walls ceilings attics roofs.
Vertical flues the majority of boiler flues exit out of a wall horizontally but if the flue from your boiler comes out at roof level then there are also some regulations that.
This ensures correct operation of the burner limits back draughts and prevents flue gases impinging on the roof.
In this case the flue goes upwards and then out through the roof.
Minimum clearance from combustible material.
We discuss fire safety fire clearances and other gas appliance venting details for b vent chimneys.
Where twin wall flue passes through a cupboard storage space or roof space a guard should be placed around it.
A flue pipe must never pass through a combustible floor or ceiling or through an attic roof space closet or concealed space.
A vertical flue looks similar to a very small chimney and can be seen spouting out steam when the heating is on.
450 mm 18 in.
When passing through the roof you need to use a flashing that matches the roof pitch.
Twin wall flue boxing in in document j page 24 25 when do you have to box in twin wall flue pipe.
When water drains air must replace the space that was taken up by the water.
The minimum clearance may be reduced by 50 percent to 225 mm 9 in if suitable shielding is installed either on the pipe or on the combustible surface.
If your boiler flue has to face out onto a public space the installer will have to ensure that it s fitted at least 2 1 metres above ground level over head height.
As the name implies air cooled systems use air for cooling.
If the vent pipe isn t installed properly the roof may leak through or around the pipe penetration leading to costly repairs.
If the flue is over 3 m from the roof apex the flue top must be 1 000 mm minimum above the roof and at least 3 m horizontally from the roof surface.
The first is known as an air cooled chimney system.
If your furnace has an afue rating of 90 percent or above it will have a flue pipe that goes out of the side of your house.
That s because the combustion byproducts are in a gaseous form so the gases can float up through the flue pipe and out of your roof.
The metal furnace flue extends vertically through the closet ceiling through the attic and roof.
This guard should be further away from its designated distance to combustibles.
