Flue Through Roof Space

Vent pipes provide this air by running outside the structure of the house.

Flue through roof space. A flue pipe must never pass through a combustible floor or ceiling or through an attic roof space closet or concealed space. Where twin wall flue passes through a cupboard storage space or roof space a guard should be placed around it. 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. As the name implies air cooled systems use air for cooling.

Twin wall flue boxing in in document j page 24 25 when do you have to box in twin wall flue pipe. If the vent pipe isn t installed properly the roof may leak through or around the pipe penetration leading to costly repairs. In this case the flue goes upwards and then out through the roof. This article series describes b vent metal chimneys used for gas fired appliances.

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. When water drains air must replace the space that was taken up by the water. As placement of the vertical flue is more complex and convoluted than a standard horizontal flue it is more costly.

The metal furnace flue extends vertically through the closet ceiling through the attic and roof. Running a vent pipe out of the roof takes some careful preparation. The vertical flue at the ceiling level is surrounded by and attached to a horizontal piece of open 1 2 x 1 2 metal mesh screen about 10 square. 450 mm 18 in.

We discuss fire safety fire clearances and other gas appliance venting details for b vent chimneys. In a through the brick and inner flue installation for a six inch. Roof apex the flue top must be at least 600 mm above the roof apex. This guard should be further away from its designated distance to combustibles.

A vertical flue looks similar to a very small chimney and can be seen spouting out steam when the heating is on. Space between the chimney walls allows for outside air to flow freely. 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 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. 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. 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.