Tests for existing flues E3 Flues in existing chimneys can be obstructed by nests, debris resulting from deterioration of the structure (e.g. brickwork, flue lining material or pieces of chimney pot) and by soot and tar. Flues in existing chimneys may also leak as a result of holes or cracks appearing in the structure and linings, particularly at joints. The top, exposed part of a chimney is particularly prone to decay. A way of checking the state of a flue prior to bringing it back into use would be to do the following:
a. Sweep the flue. This is intended to clean the flue to demonstrate that it is essentially free from obstructions and to enable better visual inspection and testing of the flue. Tar deposits caused by burning wood may be especially hard to dislodge and should be The debris that comes down the chimney when sweeping should be examined for excessive quantities of lining or brick that are signs that further repairs are necessary.
b. Carry out a visual inspection of the accessible parts to identify:
i. Deterioration in the structure, connections or linings which could affect the flue’s gas-tightness and safe performance with the proposed combustion appliance. Examine the interior of the flue and the exterior of the chimney including in the roof-space. The presence of smoke or tar stains on the exterior of a chimney/ breast is a sign of leaks that possibly indicate damage;
ii. Modifications made whilst the flue was out of service, such as the fitting of a ventilator terminal, which would be incompatible with using the flue with the intended appliance;
iii. Correct lining and lining sizes for the proposed new application.
c. Perform checks where necessary to demonstrate that the flue is free from restriction: a visual check may be sufficient where the full length of the flue can be In cases of doubt, a way of checking this would be to carry out a coring ball test.
d. Check the gas-tightness of the flue by carrying out a smoke test.
New masonry and flueblock chimneys
E4 Check during construction that liners are installed the right way up, with sockets facing upwards and joints are sealed so that moisture and condensate will be contained in the chimney. E5 Flues in new masonry chimneys can be obstructed, particularly at bends, by debris left during construction or by excess mortar falling into the flue or by jointing material extruded from between liners and flueblocks. The flues should be checked to demonstrate that they have been correctly constructed and are free of restrictions and acceptably gas-tight. A way of checking the condition of a new flue prior to bringing it into use would be to do the following:
a. Carry out a visual inspection of the accessible parts to check that the lining, liners or flueblocks are of the correct materials and of suitable size for the proposed application.
b. Perform checks where necessary to demonstrate that the flue is free from restriction: a visual check may be sufficient where the full length of the flue can be In cases of doubt, a way of checking this would be to carry out a coring ball test or to sweep the flue, which may be more effective at removing flexible debris that might not be dislodged by a coring ball.
c. Check the operation and gas-tightness of the flue by carrying out a smoke test.
New factory-made metal chimneys
E6 A checklist for the visual inspection of a newly completed factory-made metal chimney is given in BS EN 15287-1:2007 and additional checks or particular variants may be included in manufacturers’ installation instructions. Following inspection, the chimney should be subjected to a smoke test.
E7 A flue which has been relined may be checked to show that it is free from restrictions, such as from surplus material (where that can occur) and that it is acceptably gas-tight by using the same tests as would be applied in the case of a newly built flue. However, a flue which has been relined with a flexible metal liner in accordance with Paragraph 3.36 of this Approved Document may be assumed to be unobstructed and acceptably gas-tight. (The use of a coring ball or inappropriate sweeps brushes can seriously damage a flexible metal flue liner.)
E8 Where a combustion appliance is provided and connected up to the flue system as part of the work, the complete system of appliance and flue should be tested for gas-tightness in addition to testing the flue separately as above. For gas appliances, an appropriate spillage test procedure is given in BS 5440-1:2008. For oil- and solid-fuel fired appliances, suitable test procedures are given in BS 5410-1:1997 and BS EN 15287-1:2007 Annex O respectively.
Flue test procedures
Coring ball test E9 This test may be appropriate for proving the minimum diameter of circular flues. It may also be used to check for obstructions in square flues but will not detect obstructions in the corners. (A purpose-made coring ball or plate may need to be used if the flue is rectangular.) It is not applicable to fluepipes and should not be used with flexible metal flue liners. It should be carried out before smoke testing. E10 A heavy ball, with a diameter about 25mm less than that of the flue, is lowered on a rope from the flue outlet to the bottom of the flue. If an obstruction is encountered, the blockage should be removed and the test repeated. Smoke testing E11 Where an existing flue is to be checked with a smoke test, it should first be swept. E12 Two smoke testing procedures are described below. Test I confirms the gas- tightness of the whole flue and may be used for one serving a solid fuel appliance or if there is any doubt over the condition of a gas or oil flue. Test II may be used where the flue is to serve a gas-fired appliance. Neither test is a substitute for any spillage or flue draught interference test required when commissioning the appliance. Other smoke testing procedures could be used where these form part of the procedure for the installation of an approved flue or relining system. Smoke test I E13 All doors and windows in the room served by the flue should be closed. The flue should first be warmed to establish a draught, e.g. with a blow lamp or electric heater. A suitable number of flue testing smoke pellets are placed at the base of the flue, such as in the fireplace recess or in the appliance if it is fitted, and ignited. When smoke starts to form, the base of the flue or fireplace opening should be sealed or the appliance should be closed, so that the smoke can only enter the flue. (For example, the recess opening should be closed off with a board or plate, sealed at the edges or, if the pellets are in the appliance, its doors, ashpit covers and vents should be closed.) E14 Smoke should be seen to issue freely from the flue outlet or terminal. When this is established, the top of the flue is sealed. The full length of the flue should then be checked, bearing in mind Paragraph E19; there should be no significant leakage. The test should be allowed to continue for at least 5 minutes. The closures at the top and bottom of the flue should then be removed. Smoke test II E15 All doors and windows in the room served by the flue should be closed. The flue should first be warmed to establish a draught. A suitable flue-testing smoke pellet is ignited at the base of the flue or in the intended position of the appliance, so that the smoke is drawn into the flue with the rising draught. (If the pellets are placed in a recess at the base of the flue, the opening between the room and the recess should be partially closed, such as with a board, but so as to leave an air entry gap of about 25mm at the bottom.) E16 Smoke should be seen to issue freely from the flue outlet or terminal and not to spill back into the room. There should be no significant leakage of smoke from the length of the chimney inside or outside of the building. E17 Smoke tests I and II are in line with the recommendations in BS 5440-1:2008. Notes in relation to testing E18 Where warming of the flue is specified, this is intended to establish a draught, but this may take more than 10 minutes in the case of large or cold flues. E19 Appliances, where fitted, should not be under fire at the time of carrying out the test. During a smoke test, smoke should not emerge from the outlet of any other flue, as this indicates leakage between flues. When checking for smoke leakage from a flue, it should be borne in mind that smoke from a faulty flue can emerge some distance away from the original fault. In such cases, the smoke could emerge from such places as barge overhangs in the end of terrace dwellings or from window reveals in cavity walls. E20 The purpose of carrying out smoke testing is to check that flue gases will rise freely through the flue and to identify whether there are any faults, such as incorrectly sealed joints or damage that would cause the flue gases to escape into the dwelling. E21 It should be noted that smoke pellets create a pressure significantly higher than the pressure required in the product standards for natural draught chimneys and for flues having a gas-tightness designation of N1. Flues to this designation are permitted to have a leakage rate of up to 2 litre/s/m² flue wall area. Some smoke leakage may therefore be seen during smoke tests and it can be a matter of expert judgement of whether leakage indicates failure. E22 However, wisps of smoke visible on the outside of the chimney or near joints between chimney sections do not necessarily indicate a fault. If forceful plumes, or large volumes of smoke are seen, this could indicate a major fault such as an incorrectly made connection or joint, or a damaged section of chimney that requires investigation and remedial action followed by a repeat of the test.
- Diagram 1 Boundaries in this Approved Document Part J
- Diagram 2 Chimneys and flues Part J
- Diagram 3 Draught diverter and draught stabiliser Part J
- Diagram 4 Types on installation Part J
- Diagram 5 Fireplace recesses Part J
- Diagram 6 the function of hearths Part J
- Diagram 7 Measurement of flues and ducts Part J
- Diagram 8 General air supply to a combustion appliance (for sizes see Section 2,3 and 4) Part J
- Diagram 9 Ventilator free areas Part J
- Diagram 10 Location of permanent air vent openings,some examples Part J
- Diagram 11 Provision of permanent air vent openings in a solid floor Part J
- Diagram 12 Material change of use fire protection of chimneys passing through other dwellings Part J
- Diagram 13 The separation of combustible material from factory made metal chimney designated to BS EN 1856 part 1 2003 Part J
- Diagram 14 Example locations of access panels for concealed horizontal flues Part J
- Diagram 15 Bends in flues Part J
- Diagrams 16 Example notice plate for hearths and flues Part J
- Diagram 17 Flue outlet positions for solid fuel appliances Part J
- Diagram 18 Flue outlet positions for solid fuel appliances clearances to easily ignited roof coverings Part J
- Diagram 19 Protecting combustible material from uniinsulated fluepipes for solid fuel appliances Part J
- Diagram 20 Wall thicknesses for masonry and flueblock chimneys Part J
- Diagram 21 Minimum separation distances from combustible material in or near a chimney Part J
- Diagram 22 Construction of fireplace gathers Part J
- Diagram 23 Canopy or an open solid fuel fire Part J
- Diagram 24 Constructional hearth suitable for a solid fuel appliance (including open fires) Part J
- Diagram 25 Constructional hearth suitable for a solid fuel appliance (including open fires) Part J
- Diagram 26 Non combustible hearth surface surrounding a solid fuel appliance Part J
- Diagram 27 Ways of providing hearths Part J
- Diagram 28 Fireplace recesses Part J
- Diagram 30 Wall adjacent to hearths Part J
- Diagram 31 Types of gas fires Part J
- Diagram 32 Free areas of permanentlt open air vents for gas appliance installations (other than decorative fuel effect fires or flueless appliances) Part J
- Diagram 33 Ventilation for flueless gas appliances Part J
- Diagram 34 Location of outlets from flues serving gas appliances Part J
- Diagram 35 Location of outlets near roof windows from flues serving gas appliances Part J
- Diagram 36 Bases for back boilers(installation using a proprietary back boiler enclosure shown) Part J
- Diagram 37 Hearths for decorative fuel effect(DFE) and inset live fuel effect (ILFE) fires minimum plan dimensions of non combustible surfaces Part J
- Diagram 38 hearths for other appliances plan dimensions of non combustible surfaces Part J
- Diagram 39 Shielding of appliances Part J
- Diagram 40 Free areas of permanently open air vents for oil-fired appliance installations Part J
- Diagram 41 Location of outlets from flues serving oil fire appliances Part J
- Diagram 42 Location of an oil fired appliance in relation to its hearth.Minimum dimensions of the heat resistant material in the hearth and the clear zone of non combustible surface Part J
- Diagram 43 Separation of liquefied petroleum gas tanks of up to 1.1 tonne capacity from buildings,boundaries and fixed sources of ignition Part J
- Diagram 44 Location of LPG cylinders Part J
- Table 1 Air supply to solid fuel appliances Part J
- Table 2 Size of flues in chimneys Part J
- Table 3 Minimum performance designations for chimney and fluepipe components for use with new solid fuel fired appliances Part J
- Table 5 Size of flues for gas-fired appliances Part J
- Table 6 Minimum performance designations for chimney and fluepipe components for use with new gas appliances Part J
- Table 7 Protecting buildings from hot flues Part J
- Table 8 Minimum performance designations for chimney and fluepipe components for use with new oil fired appliances with flue gas temperatures less than 250deg celsius Part J
- Table 9 Protecting buildings from hot flues for flue gas temperature not more than 250deg celsius Part J
- Table 10 Fire protection for oil storage tanks Part J
- Table 11 Fire protection for LPG storage tanks(see Diagram 43) Part J
- Table to Diagram 41 Location of outlets from flues serving oil fired appliances Part J
- Calculation of opening area of Fireplace Part J
- See Diagram 40 Calculation of Vents for Open flue appliance Part J
- Calculation of Vents for Open flue boiler Part J
- Form Hearth,fireplace flues and chimneys Part J
- Table to Diagram 34 Location of outlets from flues serving gas appliances Part J
- Table G1 Temperature Classes Part J
- Table G2 Pressure Classes Part J