DO NOT set a ventilation grille in the hearth immediately in front of the fire. The cold air entering
the room will form a cold ‘curtain’ in front of the fire and may destroy the convection of warm air
around the room.
DO NOT place an air supply inlet across the room from the fire. The draught of cold air crossing
the room will scour the room of warm air and the overall heating effect of the fire will be
reduced.
DO NOT set a ventilation grille in a position where they may become liable to blockage.
Where possible, draw air from two walls at right angles and duct to a mixing chamber beneath
the floor before it enters the room. This will reduce the influence of strong winds on the supply
of air. Where an existing floor is solid, vents may have to be provided through the walls in a
manner, which achieves conditions as close as possible to the above, perhaps, by the use of
ducting or of false skirting.
Where there is a suspended floor over a well ventilated under floor space, it may be sufficient
just to set ventilation openings through the floorboards adjacent to the chimney breast. Older
houses with the possibility of draughts entering around doors and windows will still profit from the
provision of a separate air supply as, properly placed, this will stop or reduce cold draughts.
When bringing in the air supply consideration should be given to any regulations that would
effect the position of any ducting or ventilation grilles.
Fitting the Firebox
Preparation For Fitting
If installing the fire in an existing fireplace, first remove all loose material from the recess and
measure the opening and recess to ensure that the Jetmaster fire will fit. The opening must be
high enough to allow the fire, and the flue gather if used, to be put into position, and must be
sufficiently wide to permit the fire and its insulation to pass through. The recess must be large
enough to provide a clearance of 20 - 40mm (
¾
” - 1
½
”) around the sides and back of the fire.
Cut away or build up to achieve the desired dimensions. Alternative methods of creating the
required recess size are shown in the diagram below.
Where the recess is to be newly built, form the recess to give a clearance around the sides and
back of the fire of 20 - 40mm (
¾
” - 1
½
”) to accommodate the insulation.
For details of opening sizes required. See table on pages 1 & 2.
Where the sides or back of the recess have to be built up, and the masonry flue gather of the
chimney is to be used, build up to the height of the fire only and then top with a sloping fillet of
mortar to deflect any soot fall into the top of the fire.
Check that the hearth, or new plinth where this is constructed, is horizontal.
Check that the two flue outlets on top of the fire will not be restricted.
The fire surround should be flat around the sealing area of the fire. The hearth and fireplace
opening must be flat and at the same level.
10
Summary of Contents for Standard 16
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