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Installation
INSTALLATION USING A BLOCK-OFF PLATE FOR USA ONLY - INSERT:
If this unit is to be installed into a masonry replace or a zero-clearance replace with a direct connection
you must install a non-combustible seal-off device such as a block-off plate or damper adapter. By
installing a block-off plate you seal the chimney, ensuring that no smoke enters the home and sealing the
chimney to encourage draft. To construct a block-off plate follow the below steps.
1. Determine where the block-off plate will be installed; above the top of the rebox (it must be high
enough to easily install the connection pipe) but below the damper area. Look for a location that
A
B
C
D
Front of fireplace opening.
A
B
C
is level and in an area where the plate can be mounted
easily.
The measurement that will be needed are as followed (refer
to Figure 38 and 39):
A - The width at the front of the rebox at the height where
the block-off plate will be installed.
B - The width at the back of the rebox at the height where
the block-off plate will be installed.
C - Then depth of the block-off needed (the distance
between A and B).
D - The distance of the center of the ue to the front of the
replace opening. Refer to Step 3.
NOTE: In general masonry replaces have square reboxes
while zero-clearance (metal) replaces have domed rebox
tops. Therefore zero-clearance block-off plates may be more
difcult to install. Insulation may be used around the edges
to simplify sealing the plate.
2. Create a cardboard template of the dimensions with 2” (51
cm) wide anges on each side. These anges will be used to
mount the block-off plate to the inside of the rebox. Bend
the anges downwards on the template and place it inside
the replace. Continue on if the template ts correctly in
its planned location. If the template does not t, make a
new template with the required corrections until it does t
correctly.
3. With the template in place, mark the location for the center
of the ue pipe when the unit is in place. If installing a 1200
the distance will be approximately 8” or 9
15
/16” back from
the replace opening. If installing a 1700 the distance will
be approximately 12” or 14
7
/16” back from the replace
opening. Remove the template and cut a 6” diameter hole
centered on this mark.
4. Using the template make the block-off plate of 24 gauge or
thicker steel. Drill two (2) holes in each ange for mounting
the plate.
Figure 38: 3D of Dimensions needed from
the Fireplace.
Figure 39: Layout of the Block-Off Plate.