INSTALLING THE FLUE
FREE-STANDING FLUES
You MUST use a flue system which is approved by MASPORT and which complies
with AS 2918 - 1990 or NZS - 7421 1990 as appropriate. The flues and flue heat
shields recommended in Australia are detailed in the table on page 4. In Australia, a
900mm 180• stainless steel flue heat shield must be fitted unless all heat sensitive
material is at least 500mm away from the flue surface.
In New Zealand we recommend the use of genuine MASPORT flue kits. The flue
MUST be installed in accordance with the detailed instructions accompanying it. A
polished 150• stainless steel heat deflector, 1200mm long must be fitted at the back of
the flue, directly above the stove.
Detailed dimensional requirements for the flue installation are included with every
MASPORT approved flue system. The flue must be secured to the flue collar to prevent
accidental separation.
Flue installations other than strictly vertical ones are possible. See AS 2918 or NZS
7421 for information on flues passing through walls and eaves.
WHEN THE FLUE IS IN A CHIMNEY (See page eight for rear flue collar height)
For a safe installation the following matters must be attended to.
• The fireplace and chimney must be thoroughly cleaned and checked for soundness.
• The chimney must not connect to a second fireplace.
• The joint between the chimney face and the fireplace surround must be checked and
sealed to prevent leakage if necessary.
• Where the fireplace is in a heat sensitive wall it must have a non-metallic heat
resistant surround extending at least 600mm each side of the recess centreline and up to
at least 1000mm above the base of the fireplace recess.
• In New Zealand, the fireplace and chimney must comply with all the requirements of
NZS 1900 Chapter 7 - 1985, except that the specified separation between the outside of
the chimney and timber construction need not be complied with.
• A flue pipe must be fitted right up the chimney, and the space between the flue pipe
and chimney must be ventilated at the top. In Australia the area of this vent must be not
less than 10,000mm
2
, while in New Zealand it is 13,000mm
2
. The vent must be fitted
with means to prevent significant ingress of water and debris.
• We recommend fitting a horizontal register plate at the lower end of the chimney to
minimise room heat loss. The register plate should provide the same area of ventilation
as at the top of the chimney.
• Provision must be made to support the weight of the flue and to permit the free
expansion of the flue pipe when it heats up.
• The flue must be secured to the flue collar to prevent accidental separation.
MANTEL-SHELF SHIELDING
When the heater is installed in front of a fireplace, any heat sensitive material (such as a
mantel-piece) which protrudes from the face of the fireplace surround will need to be
completely shielded. This shielding is best provided by a sheet metal panel fastened
12mm from the face to be protected on heat resistant spacers. The inner edge of the
shield must abut the face of the fireplace surround and the outer edge and ends must
have an unobstructed 10mm gap to allow cooling air circulation.
FIXING THE HEATER IN POSITION
Once the flue system has been installed, the heater can be placed in position on the
hearth. Confirm that the flue is correctly aligned and that the necessary minimum heater
clearances are being achieved. In New Zealand, NZS 7421 requires that the heater and
hearth be secured to prevent shifting in the event of an earthquake. This is best done by
fastening to the floor through the holes provided in the feet, using at least two 12 gauge
screws (on diagonally opposite feet) or the equivalent sizes of coach bolts or spring
toggle fasteners.
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