Fitting The Firebox Without A Jetmaster Gather
Place the fire in front of the prepared opening. Wrap the sides and back of the fire with the
insulation and hold this in place with tape.
Slide the fire into position in the prepared recess, taking care not to snag the insulation on the
sides of the opening.
Where the opening is significantly higher than the fire, the space may be filled by brickwork.
Place a layer of insulation beneath the bricks to provide an expansion joint on top of the fire. If
more than three or four courses of brick are needed, these should be supported on a lintel or
steel bar between the jambs.
A tight and effective seal must be made all round the front of the firebox. Where slate or
marble slips are used, these should be placed behind the frame to form a sliding contact and
thus allow for the expansion of the fire. Do not allow slips, marble, plaster or brickwork etc to
abut the edge of the frame or to have direct contact with the firebox as expansion of the fire
may cause them to crack. Use a strip of insulation as an expansion joint where necessary. The
box can be sealed to the opening using the insulation supplied, or similar material in either
position shown in the diagram below. A way of achieving this is to cut off a strip of the insulation
supplied and double it over until the required thickness is achieved to form an effective seal. An
alternative way is to use a proprietary ceramic rope seal of the correct size. If the front of the fire
is not sealed, air can leak into the flue and chimney performance will be impaired. The object is
to form a dry seal that will stay flexible moving with the box as it expands and contracts, yet still
keep the firebox sealed to the fireplace opening.
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