Jetmaster UNIVERSAL, Installation & Operation Instructions, Page: 4 / 13

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Jetmaster Installation into an Existing Fireplace
Step 1. Measure the width, depth and height of your recess, too large or too small a
recess presents no problem at all.
a. Too Large – The recess can be reduced by inserting bricks at the sides,
and/or back, and, where necessary, between the top of the unit and the
underside of the lintel.
b. Too Small – The recess can be made deeper by removing the Rollback
and Smokeshelf. If the sides have to be removed this can be done,
however, it is suggested that an experienced builder carry out this work,
as the sides support the inner flues of the chimney. If the height is too low,
remove the lintel and replace it at the required height.
Step 2. Check that your chimney is clean and free from obstructions. From the
measurements taken select the size of your Jetmaster.
Step 3. Any cracks or cavities in the recess must be repaired and sealed.
Step 4. Tape the insulation to the back and sides of the Jetmaster, and slide it into
place.
Note 1. Do not recess unit by more than 110mm.
Note 2. Do not have exhaust openings at top of unit obstructed.
Note 3. Do not have air intake at bottom of unit obstructed.
Step 5. It is a good idea to light a fire at this stage, to check that all is well.
Step 6. Seal the unit into position with either silicone, a metal flange, or masonry.
Allow masonry work to dry for minimum of three days before lighting the fire.
50mm
clearance
between roofing
materials &
any other
combustible
materials
Flashing
Rotating Cowl
Ridge Line
Hearth
Flue Termination
The minimum flue length is
3.5 metres or above the ridge
line (which ever is greater).
OPEN WOOD JETMASTER - Minimum Flue Height