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Block-Off Plate Installation
Whenever this appliance is installed with a direct connection a block-off plate, or other non-combustible
seal-off device (e.g. damper adapter), will need to be installed. This device is used to seal the chimney,
insuring no smoke enters the home and providing the chimney system with a seal to promote draft. The
directions below detail the steps for construction and installation of a block-off plate.
1
Determine a location for the block-off plate at the top of the firebox below the damper area (make
it high enough to allow installation of the connection pipe). The location should be level and in an
area where it can be mounted easily. Measure the width at the rear ("A") and front ("B") of the
firebox at the height where the block-off plate will be installed (see Figure 6). Then measure the
depth of the location where the block-off plate will be installed ("C").
2
Make a cardboard template of the measurements, but add a 2" (50mm) flange to each side. This
flange will be used to mount the block-off plate to the inside of the firebox. Bend the flanges
downwards on the template and place it inside the fireplace. If the template fits correctly in its
planned location, go to the next step. If it does not, make a new template with the appropriate
corrections until it fits correctly.
3
With the template in place, mark the location of the flue (see "Dimensions" on page 6). This
location approximates the center of the flue when the insert is in place (a slight offset may occur
based upon insert and block-off plate placement). Remove the template and cut a 6-1/4"
diameter hole centered on this mark.
4
Make the block-off plate of 24 gage or thicker steel to match the template. Drill two holes in each
flange for mounting the plate.
5
Mount the block-off plate using masonry screws.
6
Insulate the block-off plate using high-temperature fiberglass insulation (Kaowool® or equivalent)
and furnace cement (allow the cement to dry for at least 24 hours before burning).
7
After placing the appliance and installing the pipe through the block-off plate, use high-
temperature fiberglass insulation and furnace cement to seal any cracks between the pipe and
block-off plate.
See the
dimensions to
determine the
location of the
center of the
flue.
© Travis Industries
Installation
(for qualified installers only)
Damper
B
C
A
Firebox
Block-Off Plate Template
2" Flanges
Measurement
(for attaching
the block-off
plate)
Measurement "B"
See the dimensions to determine the location of
the center of the flue.
100-01279
"A"
Measurement
"C"
11
Figure 6
4111102
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