Masport HORIZON Owner's Manual & Installation Manual page 18

SECONDARY AIR TUBE REMOVAL
The tube will have either one or two removable angle pins to prevent it from moving endways and
falling out. If there is one removable pin, one end of the tube will have a welded-on locating pin. To
remove the tube, simply withdraw the angle pin(s) from the tube, move it sideways until one end can
be swung down from its locating hole in the firebox side casting and then move it sideways in the
other direction to disengage it completely from the firebox.
When re-fitting the
ensure that the small air holes
will discharge generally toward
the lower front of the firebox,
rotating the tube until the
welded-on locating pin (or the
angle pin) will engage in the
slot in the cast iron firebox side
casting to maintain the correct
angular position of the tube.
Replace the angle pin at the
other end of the tube.
FIREBOX TOP BAFFLE
The special top baffle material operates at very high temperature to ensure clean burning. Take care
not to knock and damage it. For flue cleaning or baffle replacement the secondary air tube must first
be removed as described above. When replacing the baffle, ensure that it is sitting on top of the
supporting shelf at each end and that it is pushed right to the back until the front corners drop behind
the small retainer ribs on the shelves. Re-fit the secondary air tube.
FIREBOX LINERS
While the insulating boards or firebricks are durable, they will eventually require replacement. A
cracked liner does not require replacing unless it will no longer stay in position in the firebox.
All Masport models have either fire-bricks or insulating board to line the firebox. (Some models have
insulating boards already fixed in position at the factory). In the other models, two of the bricks or
boards fit across the back of the firebox wall, and the others fit against the end walls. No force should
be required to fit them, and they can be removed, if desired, for flue cleaning. However, they MUST
be in place, and in good condition, before lighting the fire. Each brick or board is fitted in the same
way. Angle it into position with its top corner behind the upper retaining lug, then swing it until it is
parallel to the wall with its bottom corner behind the lower retaining lug. Lower the brick or board
into position. In some models there are two boards at the rear and at each end. In that case, fit the
metal retaining channel over the top edges of these pairs of bricks or boards to hold them in line. The
wider leg of the channel goes next to the firebox wall.
tube,
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