Air supply
All hydrocarbon burning appliances require an oxygen/air supply.
Under Reg J in the UK, an air vent is required minimum of 8,500mm sq.
If the chimney/cooker is to be fitted on an external wall the air supply can be taken straight from the
outside. A 5” (100mm) diameter hole needs to be drilled in the correct place, 138mm above the hearth and
the cooker ‘manifold/extension air pipe’ kit purchased and fitted. A proprietary grille is supplied with the
kit, if not used an air brick or non
-
closing vent should be fitted to ensure the air supply is not blocked in any
way.
The manifold method of supplying air is always to be preferred as there will be no draught in the room
especially when the cooker is not in use.
If the cooker is not on an outside wall or the direct air supply method cannot be used, an air vent must be
supplied in the room in which the cooker is fitted.
The sizes of the vents required is: 1650mm sq. (100mm diam.)
Only permanently open vents can be used and consideration should be given to draught when the cooker is
not in use. Site these vents carefully. The vent covers should comply with Building Regulations Part J and
should be sited where they cannot be blocked.
Extractor Fans: These suck air out of the room and cause a negative pressure in the room so they must have
their own air vent to counter this. Even when the air is taken directly from the outside using the manifold
system a vent will be required for any extractor fan fitted in the same room or adjacent rooms. Great care
must be taken with restaurant/café kitchens which have professional levels of extraction.
Chimneys
A chimney of minimum 6” diameter (150mm) and a minimum length of 4 meters and it must comply with
Building Regulations J. Never share the flue with another appliance.
Without a chimney to Building Regulations specifications there could be insufficient draw on the chimney to
pull enough oxygen through the appliance to make it burn properly.
If you live in a valley or are surrounded by tall trees or buildings you might experience downdraught
problems where the wind tries to stop the fumes rising up the chimney. An anti-downdraught cowl might
help, but anti-downdraught cowls reduce draw, so will not work on single story chimneys and those with
insufficient draw.
We recommend you seek the advice of the manufacturer or a HETAS or NACE registered supplier and
installer before purchasing any cooker or heating appliance.
We recommend any chimney larger than 200mm is lined using a Class I liner, and backfilled with insulation
to Building Standard requirements. We recommend using the ECO Range register plate adaptor and
adjustable vitreous enamel flue pipe which is designed for easy fitting.
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