
4
Montpelier Medium Insert
30004403
SAFETY NOTICE: IF YOUR MONTPELIER MEDIUM
INSERT IS NOT PROPERLY INSTALLED, A HOUSE
FIRE MAY RESULT. TO REDUCE THE RISK OF FIRE,
FOLLOW THE INSTALLATION INSTRUCTIONS. CON-
TACT LOCAL BUILDING OR FIRE OFFICIALS ABOUT
RESTRICTIONS AND INSTALLATION INSPECTION
REQUIREMENTS IN YOUR AREA.
Requirements for Existing Fireplaces
The Montpelier Medium Insert is listed for installation
within a properly built masonry or heat circulating, ma-
sonry-type replace that is constructed in accordance
with the requirements of recognized building codes. A
heat-circulating masonry-type replace must conform to
building code standards for masonry replaces, and must
consist of a factory-built metal rebox with air circulation
pathways that are surrounded by masonry materials. Air
circulation pathways must not be blocked by the insert or
surround panels.
The replace and chimney must be clean and structurally
sound. Have them inspected by a qualied professional
chimney sweep, a mason, or your Vermont Castings’
Authorized Dealer before the Montpelier Medium Insert is
installed. Any deterioration (cracks, loose mortar or loose
bricks) must be repaired.
Codes may permit removal of the damper in order to make a
positive vent connection between the rebox and the chim-
ney. However, the replace should not be modied in any
way without rst checking with your local building inspector
or re marshal. Provision should be made to restore the
replace to its original condition if the insert is removed.
Do not remove bricks or mortar that may jeopardize the
compliance of the replace with local building codes.
The Montpelier Medium Insert is not listed for instal-
lation in factory-built replaces.
Requirements for Existing Chimneys
Chimney requirements differ for the U.S. and Canada.
Specications for each are listed below. Connect the
insert to the chimney in accordance with local codes and
the requirements of the listing agency as specied in this
manual.
Chimney Height / U.S. and Canada
Chimney height should be no less than 15’ (4.5 m) above
the hearth and no more than 35’ (10.5 m).
The chimney should extend at least 3’ (914 mm) above the
highest point where it passes through a roof, and at least
2’ (610 mm) higher than any portion of a building within
10’ (3 m). (Fig. 2)
DO NOT CONNECT YOUR MONTPELIER MEDIUM
INSERT TO A CHIMNEY FLUE SERVING ANOTHER
APPLIANCE.
Installation
U.S.
In the U.S. (ANSI/NFPA 211, 1988), when
installed in a masonry replace:
• A connector must extend from the ue collar
to the ue liner.
•If a stainless steel liner is not used, the connector
must extend at least four (4) feet from the ue collar
of the insert.*
• The cross sectional area of the ue must be less
than or equal to three times the area of the ue
collar. If larger, the chimney must be re-lined.
• Means must be provided to prevent room air
passing to the chimney cavity.
• Provision must be made for removal of the
insert to clean the chimney ue.
General Considerations / U.S.
• While not required in most jurisdictions in the U.S.,
Vermont Castings Group strongly recommends
that a full stainless steel chimney liner be installed
for the insert to the chimney top to increase overall
performance and to ease and reduce yearly main-
tenance.
• A masonry chimney must be well-constructed and
must meet minimum code requirements. The chim-
ney ue should have a code-approved liner made of
masonry or pre-cast refractory tiles, straight or ex-
ible stainless steel pipe, or a poured-in-place liner.
An unlined chimney must be relined professionally.
• The chimney must have a nominal ue size of 6" (152
mm) diameter or 28 square inches (181 cm2) but no
greater than 3 times larger or 85 square inches (548
cm2). A chimney larger than this must be re-lined.
Be aware that a chimney originally designed for replace
use may perform differently when used to vent an air-con-
trolled 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
2’ Min.
2’ Min.
3’
Min.
0 To 10’
3’
Min.
0 To 10’
AC617
RLTSKC8
2/11/98
AC617
Reference
Point
Fig. 2 The 2’-3’-10’ rule for chimneys.
* This requirement is in addition to those specied in ANSI/NFPA211.