Jetmaster 500 - Unit Size and Chimney Flue; Recess Adjustments

5
Additional heat can be obtained from an existing fireplace by installing a
Jetmaster unit either from the regular range or custom-built to fit with a minimum
of building work.
2.1 Unit size and chimney flue
The size of Jetmaster firebox that can be installed into your existing
masonry fireplace is determined by the minimum dimensions of the
chimney flue.
Minimum flue areas are:
Model
2
500, 600 - 300 cm
2
700S, 700D - 366 cm
2
700 Double sided - 950 cm
2
850 - 510 cm
2
1050 - 730 cm
2
1200 - 1175 cm
2
1500 - 1475 cm
Before installing the firebox, ensure that the flue is of the correct area
throughout its entire length.
This can be done by lowering a torch (attached to strong cord) down the
chimney.
2.2 (a) Recess too large:
If the size of the firebox is smaller than the size of the recess, this can be
reduced by laying bricks at the sides and/or back and where necessary
between the top of the unit and the underside of the lintel or a plinth
can be constructed (refer Fig. 3). Leaving enough room for the
insulation.
(b) Recess too small:
The recess can be made deeper by removing the roll back and
smokeshelf. If too narrow cut away brickwork at sides and if height is
too low, remove the lintel and replace it at the required height.
NOTE: Allow 25 mm all round for the fibreglass insulation.
2.3 The two flue outlets must marry up with the existing chimney as indicated
in Fig. 3.
2.4 Any cracks or cavities in the recess must be repaired and sealed.
2.5 Tape the insulation to the back and sides of the Jetmaster and slide into the
recess, taking care not to snag the fibreglass insulation against the sides.
2.
Installation of Universal model into existing masonry fireplaces
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