The minimum installation clearances for certified double-wall flue pipes are much less than those for single-wall pipes. Also, the maximum length of a double-wall flue pipe assembly may be greater than is permitted for a single-wall pipe.
There are two general types of double-wall flue pipes: sealed and vented. A sealed double-wall flue pipe is effective at retaining the heat in the flue gases because the air space between the inner liner and outer shell acts as an insulator.
A sealed double-wall pipe is a good choice to maximize draft and minimize creosote deposits. Use sealed double-wall pipes if the assembly must be long or if the appliance is expected to produce low flue gas temperatures.
The system to the left uses a sealed double wall telescopic length between the stove and chimney. A vented double-wall pipe allows cooling air to pass between the inner and outer layers. Where the flue pipe assembly is short and straight, a vented double-wall pipe can be acceptable.
However, vented pipe is not a good choice for longer flue pipe assemblies or for appliances that are expected to produce low flue gas temperatures. Nice Things Readers Say "Dear wood heat i have enjoyed your site and found it very informative.
Flashings for tiled roofs have a large base which needs to be secured underneath the tiles whereas Flashings for every other roof type flat, corrugated, wooden etc. And the final aspect of your flue system is ensuring you attain the necessary overall height and choice of suitable terminal…. For an internal Twin Wall system rising up through the roof surface, you must consider all four of the following building regulation requirements:.
These are fairly straight forward to understand but please bear in mind, no Rain Cap is water tight and Anti-Wind Cowls are only advised for longer systems that create a sufficient draw and are located in open or exposed areas such as hillsides, by open land or water fronts. Thanks very much for your enquiry. I have passed this on to our Customer Services Team who will respond to you directly and provide you with the advice needed. Im costing to install a Hwam in my bungalow with a top mounted flue direct up no bends.
Which one should I be costing? I have passed this on to our Customer Services Team who will respond to you directly. This is obviously a twin-course plus insulation space pillar, rising up from the dwarf-wall that goes all around the base of the conservatory. The roof is complex all glass, double-hipped i. So, my question is, will the pillar be thick wide enough?
Any other thoughts? I am experiencing poor burning and fumes into the room. And glass blacking up. My Woodburner was installed with a Horizontal flue from the rear, through the wall, and then a 90 degree bend. Well over mm in Length.
Is this an illegal installation. Many Thanks. There should be no horizontal runs in a flue system and no 90 degree turns. Both of these are hinderences to the draw which is resulting in your poor burning, fumes leaking into the room and blackening glass. The stove and draw are simply not getting up to temp. Hi I think that I understand the installation of the flue and wood burning stove , what I am unsure about is the type of house that we have got was built in app it has a open fire ,I believe it is called a fire box as it has got a damper there is a flue that appears to sit on on top of it.
How do I remove it? Thanks for any suggestions. Our advice in these situations would always be to contact a local HETAS registered installer to visit your property and advise on how best to remove the existing system. When it comes to the compatibility of Twin Wall, you must stay within the same brand I am afraid and so this Convesa H-Cowl will not connect to a Dinak flue system.
We offer an extensive range of stoves perfectly sized for a summer house and can advise on a safe and effective twin wall flue system. The outside of my wall where the pipe passes through is cemented round the flue i hear bangs when it is cooling down is this ok. It may be that the incorrect plaster has been used and you are not allowing for the thermal expansion and contraction of that pipe.
After my flue passes thru the wal does the chimney have to go staright up? Instead of going thru my roof overhang can I angle out to the edge of the overhang then up the rest of the way? You are permitted a maximum of 4 turns in any one flue system and typically as far as an external Twin Wall flue system is concerned, these would be used 1 inside and 3 outside; 1 to turn the sytem vertically and 2 to negotiate around guttering or soffits etc.
It really depends on which stove you are interested in and where you are installing. External or Direct Air allows for a constant supply of fresh air for your fuel but not utilising it wil mot impact on the performance of your stove necessarily. My twinwall flue is going through a wall.
When using a 45 degree wall sleeve, should I pack it with Rockwool between the sleeve and the flue pipe, and leave a 60mm airgap around the outside of the sleeve. Or should I leave an airgap between the sleeve and flue pipe and pack Rockwool around the outside of the sleeve? You can fill the gap between the Twin Wall Pipe and the Wall Sleeve with rockwool but most keep this gap clear.
This measurement is along the 45 degree line? I see many flues outside at 2 metres with similar height. Your installer is absolutely correct.
If your property is a Listed Building permission may or may not be required. If you intend your new flue pipework to run up the outside of an external wall depending on the position e.
Do I need to line my existing chimney? Older houses will normally just be exposed brick inside - it is not a legal requirement to line these older chimneys unless they are leaking, but there are often advantages to lining such as increased draw, piece of mind of having a sealed system top to bottom, reduced risk of chimney fire or leakage etc. Your local chimney sweep should be able to clean the chimney and advise on it's condition if you are not sure.
We always advise that chimneys in older properties should be lined. Our flexible chimney liner kits are great value for money and will ensure best performance for your stove. If you are unsure, please give us a call and we can discuss this with you.
Hearth requirements. These stoves can therefore be placed on a non-combustible hearth of a minimum thickness of 12mm. The material could be e. Other stoves usually larger models should sit on a constructional hearth made of solid non-combustible material such as concrete, at least mm thick.
Combustible materials should not be placed beneath constructional hearths unless there is an airspace of at least 50mm or the combustible material is at least mm below the top of the hearth. For free-standing appliances i.
There must be a minimum of mm from the sides of the appliance to the side and rear edges of the hearth and mm for stoves designed to be used with the door closed from the front of the appliance to the front of the hearth. This may sound backwards considering the direction in which the flue gas is traveling. You can install an outdoor fireplace without a building consent, although you may still need a resource consent.
The pipe should be as straight and short as possible, with sections properly secured. The horizontal portion of the pipe should rise not less than one-quarter inch to the linear foot, to insure a good draft. You should not pass a stove pipe through a combustible wall for a hook-up with a chimney flue. Chimney Heights and Termination The minimum chimney height recommended for minimum performance of wood burning and multi fuel appliances is 4.
It is best to position the chimney, so that it goes straight up as near to the roof ridge as possible. Stovepipe must have a minimum of three opposing screws at each joing. Never pass stovepipe through a combustible wall unless you have a UL Listed thimble. A damper is usually located approximately 12 to 18 inches from the stove, prior to the spot where the pipe exits into a chimney, if present.
The damper retains heat that escapes up the chimney or flue. It allows this heat to dissipate into the area being heated by the woodstove. Local Councils are legally obliged to investigate complaints made under the Environmental Protection Act relating to public health and nuisance issues, which include smoke and fumes from fires or stoves.
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