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.
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
One vent 160mm
One vent 165mm
WKO180
One vent 180mm
One vent 185mm
WKO200
One vent 200mm
One vent 210mm
WKO210
One vent 210mm
One vent 220mm
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.
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
Contact Neil Jewell Branch Manager, 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 get the 50% discount off the list price for Nova SM .
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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