An alternative use for the Jetmaster gather is to form a permanently fixed shuttering, supported
by masonry piers. Gather support brackets may be made and fixed to the sloping sides of the
gather at a height suitable for the piers. The cavity above the gather may be wrapped with
flexible insulation or back filled with vermiculite cement.
The fire may then be slid beneath the gather and sealed in a similar manner to that without a
Jetmaster Gather.
It is essential that the system be sealed at each joint so that the only air, which can reach the
flue, is that which enters through the front of the fire. Once the sealing has been carried out,
the chimney breast may be infilled with block work. The firebox, using an expansion joint or
resilient insulation, may support three or four courses of brick but any greater quantity should be
supported on a lintel or steel bar between the jambs.
Some fires, when installed on very smooth surfaces have a tendency to creep forward after
a period of use. If this happens it can degrade the sealing arrangements and impair the flue
draw.
To prevent this a pair of pins, say 5mm in diameter may be sunk into the hearth and left to
protrude by 3mm. A matching pair of holes drilled into the base of the convection air inlet will
enable the fire to be pushed back and engaged over the pre-fitted pins.
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