Installation
4. Using the template make the block-
off plate of 24 gauge or thicker steel.
Drill two (2) holes in each flange for
mounting the plate.
5. Mount the block-off plate using
masonry screws in a masonry
fireplace and sheet metal screws on a
zero-clearance fireplace (screws need
only be long enough to penetrate the
first layer of metal).
6. Insulate the block-off plate using high
- temperature fiberglass insulation
and furnace cement.
7. After installing the unit into place and
the pipe through the block-off plate,
use high - temperature fiberglass
insulation and furnace cement to seal
any gaps between the pipe and block-
off plate (allow the cement to dry for
at least 24 hours before burning).
Figure 19: Insert Install into a Zero-Clearance Fireplace.
Fig. 20: Masonry Fireplace Direct Connection Insert
20
Mantel
Surround Panel
USA 16” (406 mm)
CND 18” (450 mm)
Block-off plate or
damper adaptor.
Stainless steel chimney
connector must extend
12" (305mm) past the
block-off plate.
Damper must
be removed
Zero-clearance
(metal) firebox
Masonry Fireplace
Mantel
Damper removed
or fastened open
Surround Panel
USA 16” (406 mm)
CND 18” (450 mm)
Block-off plate or
damper adaptor.
The stainless steel
chimney connector
must extend 12"
(305mm) past the
block-off plate.
Zero Clearance Notes:
The fireplace must not be altered, except for the exceptions below. The
permanent metal warning label provided must be attached to the back of the
fireplace, stating that the fireplace may have been altered to accommodate
the insert, and must be returned to original condition for use as a conventional
fireplace. The following modification of factory built
fireplaces are permissible: removal of damper, removal
of smoke shelf or baffle, removal of ember catches,
removal of fire grate, removal of viewing screen/curtain,
and removal of doors. The factory built chimney must be
listed per UL 127 (US), and meet type HT requirements
of UL 103 (US). Factory built fireplace chimneys tested
to UL 127-1998, may be at the fireplace manufacturer’s
option, tested to the same criteria as UL 103 HT
requirements. If the chimney is not listed as meeting HT
requirements, or if the factory built fireplace was tested
prior to 1998, a full height listed chimney liner must be
installed from the appliance flue collar to the chimney top.
The liner must meet type HT requirements (2100°F) per
UL 1777 (US). The liner must be securely attached to the
insert flue collar and the chimney top. To prevent room
air passage to the chimney cavity of the fireplace, seal
either the damper area around the chimney liner with high
temperature sealant or the fireplace front with fiberglass
batting.
