SUMMARY OF BUILDING REGULATIONS:

The Department of Environment have drafted building regulations and as part of this there is a Technical Guidance Document J which outlines the standards for flues. You can download a copy of the full document to ensure that you are fully familiar with the regulations, here.

Flues may be made of steel, stainless steel, cast iron. Mainly flues for stoves and boilers are steel. They come in a variety if diameters for attaching to the appliance. These are 80mm, 100mm, 125mm and 150mm. They come in a variety of lengths from 250mm to 1250mm, as well as adjustible lengths. Also there are some angled bends such as 45° and 90 °bends and tees, as well as connection pieces.

Regulations require that:

• the materials meet a certain quality standard
• Direction - Flues should be vertical unless a bend is necessary. Horizontal flue runs should be avoided except in the case of a back outlet appliance, when the length of the horizontal section should not exceed 150 mm.

• Source: Technical Guidance Document J Building Regs. 1997

  The above is an illustration of flue outlets.

  Other brief details:

• Stoves - Either twin wall rigid flue is used of 316 quality or flexible flue. Rigid flue must finish 1m above the guttering, and flexible flue must go 1m above the top of a masonry chimney.
• Boilers - Typically rigid flue of 316 quality. For our Twin Heat appliances a minimum height of 5m is required. For gasification, a minimum of 12 - 15 feet is required. Diameter is decided by manufacturer of appliance.
• A masonry chimney can be constructed also.

RIGID FLUES:

Rigid flues are used for stoves where an existing chimney does not exist, for example if you locate a stove on an outside wall, you can use install a flue to go through the wall up to the height required by building regulations. They are typically 316 quality. Two examples are shown below:

Type one is when the appliance has a back outlet, and type two is when the appliance has a top outlet. (Source: MI Flues)

They come in a variety if diameters for attaching to the appliance. These are 80mm, 100mm, 125mm and 150mm. They come in a variety of lengths from 250mm to 1250mm, as well as adjustible lengths. Also there are some angled bends such as 45° and 90 °bends and tees, as well as connection pieces.

FLEXIBLE FLUES:

Flexible flues are used for stoves or boilers where an existing chimney does exist. The flue acts as a liner as the outlet on the appliance may be smaller than the diameter of the chimney. Again they come in a variety of diameters, and can be cut to suit the length required.

FLUE ACCESSORIES:

• In the case of extreme down-draft then a h-cowl can be used. We recommend these for use in all cases.
• In the case of extreme up-draft then a draft stabiliser can be used. We recommend use in all cases for more efficient working of the appliance, including lower fuel consumption.

FLUES

Flue pipes are used to connect an appliance to a chimney or in itself to carry exhaust gases from the appliance.

Please click on one of the following sections for a more detailed description.

Summary of building regulations
Rigid flues
Flexible flues
Flue accessories

Looking to buy some flues?

We supply all types of flues to anywhere in Ireland, please contact us with your requirements and we can get back to you with a price.