Where wood burning boilers are located in an area where escape of combustion gases is deemed undesirable it is recommend to fit a Chimney Exhaust fan.
These can be wired separately from the boiler and can be turned on as and when you are filling the loading chamber of the wood burning boiler. When you have completed the loading and shut the door the fan can then be switched off. You can also switch the fan on when you are starting the fire. By leaving the bottom door ajar whilst leaving the loading chamber door shut you can open the chimney flap and switch the fan on to aid the draw. This helps especially if you have a short chimney flue with limited draw.
It is imperative that you ensure you shut the chimney flue flap each and every time after re-loading. The only time you have the chimney flap open is when you are starting a fire or during the process of re-loading, Failure to do this can have serious consequences as the heat from the fire can cause irreversible damage and pose a grave fire risk.
We supply as follows depending on the vent at the back of the Angus Super or Angus Evo;
WKO160 for EV-03 17kW to EV-07 46kW ((they all have 150mm rear vents). Here we would suggest 6" twin wall flue.
WKO180 for 18kW Angus Super and Angus Evo EV-08 51kW to EV-10 60kW (they all have 180mm rear vents). Here we would suggest 7" twin wall flue. We would recommend that a WKO180 chimney fan is used for the EV-08 51kW to EV-10 60kW as per the instruction manual to allow the wood gases to be sucked up the vent when reloading or to be used where there is not enough natural chimney thrust.
WKO200 for 25kW + 40kW Angus Super (they all have 200mm rear vents). Here we would suggest 8" twin wall flue.
WKO210 for 60kW + 80kW Angus Super (they all have 210mm rear vents). Here we would suggest 9" or 10" twin wall flue.
There is a graph in the operating instructions of the Angus Super and the Angus Evo with height recommendations for your twin wall stainless steel flue to ensure you have the appropriate chimney thrust. (approximately 20 Pascal).
If you order the chimney exhaust fan it is possible to have shorter vertical stacks on the twin wall flue. This will typically be 4.5 metres.
The actual vent sizes are as follows;
WKO160
Large vent OD 166mm ID 160mm (mounted on boiler flue)
Small vent OD 160mm ID 154mm
The boiler's rear vent is 159mm +/-1mm
WKO180
Large vent OD 186mm ID 180mm (mounted on boiler flue)
Small vent OD 180mm ID 174mm
The boiler's rear vent is 179mm +/-1mm
WKO200
Large vent OD 206mm ID 200mm (mounted on boiler flue)
Small vent OD 200mm ID 194mm
The boiler's rear vent is 199mm +/-1mm
WKO210
Large vent OD 216mm ID 210mm (mounted on boiler flue)
Small vent OD 210mm ID 204mm
The boiler's rear vent is 209mm +/-1mm
The larger vent can be fitted directly over the rear vent of the boiler or if installed on the vertical stack of a stainless steel twin wall flue it is important to ensure that the larger vent is at the bottom and the smaller vent at the top. This will ensure that the fan blows the gases in the correct direction.
All our wood burning boilers must be fitted with an appropriately sized stainless steel twin wall flue (single wall flue is not suitable due to condensation problems).
We would suggest the Nova twin wall flue range and this is available from www.fluepipes.com.
It has the ability to have a 3 metre unsupported final section if required that can handle 100mph winds.
Please point out that you are ordering an Angus Super Gasification boiler and you will be able to obtain discounted rates on this particular range. The full contact details are as follows;
MMF Southern, Flue House, Portway Trading Estate, Portview Road, Bristol, BS11 9LQ
Tel 0117 982 8252
Please make sure you contact the Avonmouth branch only and if you are placing an order put it on the 'Eco Angus Pro Forma account' so that you obtain the preferential rates for the Nova SM range.
Generally the standard connection to the boiler will be with a 45 degree elbow with a 135 degree tee before the vertical stack with a condensate collector at the bottom of the flue.
It is also possible to flue into a lined chimney stack or a brick chimney stack with double skin multi fuel flexible flue lining. Ideally you need to sweep your stack or flue 2 to 3 times a year to remove any fly ash deposits. If you can incorporate a sump at the bottom of the chimney stack this will enable you to use a shovel to remove the fly ash. This can also be incorporated with your stainless steel twin wall flue. Fly ash should be removed on a monthly basis. Otherwise you should have an inspection chamber at the bottom of the stainless steel twin wall flue and the fly ash will need to be removed every 2 weeks.
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