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Oil Fired Models - Flues

An Oil-fired Aga requires some form of flue or chimney system, so as to safely remove the natural products of combustion, at the same time taking cooking smells and steam from the ovens.

For the Aga to work properly, the chimney must be constructed of the the appropriate materials and rise to a satisfactory height, whilst complying with current legislation, such as the Building Regulations.

The need for access to a chimney will probably dictate the position chosen for the Aga, and we would strongly advise that your local Aga Distributor be asked to carry out a survey of the proposed site.

Two main chimney arrangements are available (see illustration below):

1.To use a masonry chimney, suitably lined with an appropriate material and terminating at a height above the main roof ridge. An original, rigid lining would be of at least 150 mm diameter, but if a stainless steel flexible lining is used, this may be 125mm diameter.

2.Where no convenient chimney exists, it is possible to use a twin walled, factory insulated, prefabricated, stainless steel chimney system, the internal diameter of which should be at least 127mm.

3. A cleaning access door is to be provided on the first flue bend fitted adjacent to the Aga, or in a similar convenient position so as to clean back towards the Aga.

Whichever arrangement is chosen there are several requirements common to both:

No flue sharing with other appliances

Bends to be kept to a minimum and must not be less than 135 degrees from the vertical.

For aesthetic reasons, black vitreous enamelled, single skin, cast iron pipe may be used to connect between the Aga and the main chimney. The pipe will be 100mm diameter, rising vertically from the top of the Aga, before bending at 45 degrees into the chimney, where necessary. Single skin pipe must not extend outside of the kitchen area.

Alternatively, it is sometimes possible to use a rear connection from the Aga (2 and 4 oven kerosene models only), horizontally through the rear wall and into a chimney situated immediately behind. The horizontal pipe must be no longer than 150mm, I.e. the thickness of a single brick.

The flue or chimney must terminate above the main roof ridge.

In most cases a simple rain-cap should be sufficient as a terminal, but occasionally a venturi type cowl may be helpful, to overcome the effects of intermittent down draught, caused by the proximity of trees or other topographical features. Consider using the ‘Vedette’ or ‘O-H’ cowls. Electrically powered fanned flues are not recommended, due to the possible ill-effects in a power cut situation.

The Aga oil burner requires a low, but consistent negative draught to function correctly. High up-draughts, experienced in windy or tall chimney locations, can adversely affect performance. Where this is likely to occur, we recommend an automatic ‘Draught Stabiliser’, to maintain the draught at the appropriate level. This is fitted in the flue pipe, adjacent to, and in the same room as the Aga.