The installation of Poujoulat chimney systems shoud be as detailed in our installation instructions and should also be in accordance with the requirements of the UK Building Regulations Part J for combustion equipments effective from April 2002, you can review the document at the weblink below:

Combustion appliances and fuel storage systemes.

The UK Building Regulations Part J for combustion equipments effective from April 2002. Now include, amendments to termination requirements for both conventional and low level discharge termination of flues serving gas and oil appliances. And covers termination requirements for all appliances eg. gas, oil or solid fuel. With rated output up to 45 kW, and Gas Fired appliances of rated input up to 70 kW. It should be noted that Building Control Officers can legitimately quote Building Regulations to apply the same criteria to appliances in excess of those ratings, and the Building Regulations do not, as is often thought, just relate to residential property. They apply to the provision of combustion equipment in any situation, other than in some types of buildings which are exempted by the Building Act 1984, usually some factories and military buildings.

UK REGULATIONS TERMINATION CHARACTERISTICS

Flue termination when incorrect can create significant problems. Whilst Building Regulations quote minimum criteria, as detailed in the following pages, it should not be assumed that where the height complies with the Regulations, the flue is high enough. There are other British standards that require additional regulations to be complied with, that may affect the termination height. Also, an appliance or an open fire may require a specific height of the chimney for the correct operation of the appliance. Please check appliance manufacturers’ installation instructions where appropriate, for their minimum requirements. Two storey buildings, have such heights that would generally provide enough draught for the correct operation of the appliance, however, bungalows or single storey extensions, on the other hand, could have insufficient if terminated in accordance with the Building Regulation requirements and may require a height in excess with minimum requirements to operate correctly. With solid fuel and oil, most appliances will normally require a chimney which terminates at least 4.5 metres (14 feet), above the appliance. Pressure jet burner oil appliances have the least onerous mandatory criteria applied to them, and will usually function with a flue only designed to discharge the products externally. Oil-fired appliances fitted with a draught hood are commonly fired with a vaporising burner. These will normally require the chimney to terminate as if a solid fuel appliance, unless otherwise stated by the appliance manufacturer.

Terminal positions & Height

The termination of a flue in a barometrically induced positive pressure zone can severely interfere with the correct operation of a chimney. Although the terminal regulations indicated later should be adhered to there are some occasions when the location of the flue should dictate the position of the appliance. Local geographical and topographical features as well as the position of the flue terminal relative to the building roof design and orientation can all individually and collectively impact the terminal and influence the draught. Please contact Poujoulat UK Ltd for advice.

UK Guidance Book: Construction/Adaptation/renovation of chimney flues