5
Montpelier Medium Insert
30004403
Be aware that a chimney originally designed for re-
place use may perform differently when used to vent
an air-controlled appliance such as your Montpelier
Medium Insert - even if the ue is less than 3 times
larger than the ue collar. For example, a chimney on
an outside wall may not heat up enough to sustain an
adequate draft. Such a ue can often be improved if it
is relined to reduce its size and/or insulated to keep it
warmer.
• A positive ue connection must be made between
the Insert and the rst masonry tile or prefabri-
cated metal chimney section. A positive ue con-
nection consists of a plate that seals or replaces
the replace damper and a section of chimney
connector that passes through the plate into the
chimney.
• The chimney connector must be a minimum
equivalent to a 6” (15 mm) diameter opening
and must be 4 gauge or heavier stainless steel.
The connector must extend four (4) feet mea-
sured from the collar of the insert.
Chimney Connection systems are available from a
variety of manufacturers. Your Vermont Castings dealer
can recommend a system that will best meet the re-
quirements of your particular installation.
• The chimney must be sealed off from room air,
either by a plate at the damper level or by sealing
the replace opening.
• Unused openings to the ue must be sealed with
masonry to the thickness of the chimney wall.
Openings sealed with pie plates or wallpaper are
a hazard. In the event of a chimney re, ames
and smoke may be forced from the openings.
• A full chimney liner meeting ULC S635, Class III
(stainless steel) must be installed from the insert
to the chimney top, and securely attached to
both. The damper may be removed to accommo-
date the liner.
• The opening of the replace around the insert
must be sealed to prevent room air passing to the
replace cavity.
• Existing air-circulation chambers in a replace
with a steel liner may not be blocked.
• Provision must be made for removal of the insert
to clean the chimney ue.
• The existing replace damper (if any) should be
locked in the open position.
• A permanent metal warning label must be afxed
to the back of the replace stating the replace
may have been altered to accommodate the
insert, and may be unsafe to use as a conven-
tional replace. (A Fireplace Modication Tag is
included in the hardware bag inside the Montpe-
lier Medium Insert.)
The Montpelier Medium Insert will t most replaces.
To conrm that it will t yours, measure the lintel depth,
plus the height, width, and depth of your replace and
hearth. Compare them to the measurements in the ac-
companying chart. If you choose to install a new hearth
over an existing replace hearth, be sure to take its
thickness into consideration when measuring both front
and back height of the replace and clearances to any
existing trims and mantels.
The unit can be installed virtually ush with the replace
opening or it can extend 3” (76 mm) onto the hearth
using the optional 3” Hearth Extension Kit. Figure 3
gives minimum and maximum dimensions for replaces
which will accommodate the Montpelier Medium Insert
in the ush mount conguration and using the optional
extension kit.
The clearance between the Montpelier Medium
Insert and the mantel, top trim and side trim cannot be
reduced by installing shields.
Another requirement to consider is the clearance for
movable items such as tables, bookcases, rugs, furnish-
ings, and your woodbox. All combustible materials of
this type should be a minimum of 48” (10 mm) from
the front surface of the Montpelier Medium Insert. Be
sure that family members are aware of this requirement
as well, so they too will keep objects a safe distance
from the Montpelier Medium Insert.
