Hearthstone Quality Home Heating Products, Inc
® Green Mountain 40 (Model 8640)
15
chimney.
Use only code approved masonry
chimneys containing a proper flue liner.
Before connecting to a masonry chimney, hire a
professional to examine the chimney for cracks,
loose mortar, and other signs of deterioration and
blockage. If the chimney needs repair, complete
them before installing and using your stove. Do not
install your stove until the chimney is safe for use.
Ensure the chimney’s cleanout is complete and
working properly. To avoid a loss of draft, the
cleanout door must close completely and provide a
tight seal. If the cleanout door leaks, the chimney will
cool, your stove will perform poorly, and creosote
can form.
Ensure the size of the chimney’s flue is appropriate
for this stove and that it is not too large. Use a
masonry chimney with a maximum 6” Diameter or 8"
x 8" (203 mm x 203 mm) tile size for best results. An
oversized flue contributes to the accumulation of
creosote.
Use the following checklist to ensure that your
masonry chimney meets these minimum
requirements:
M
ASONRY
C
HIMNEY WALL CONSTRUCTION
:
•
Mortared brick or modular block at least 4" (102
mm) thick – must use liner
•
A mortared rubble or stone wall – must use liner
F
LUE LINER OPTIONS
:
•
Tile - minimum wall thickness of 5/8" (16 mm),
installed with refractory mortar, and with at least
1" (25 mm) air space around the liner
•
Stainless steel - UL listed 6” diameter, insulated
or wrapped liner, or the space around the liner
filled with vermiculite or suitable material (these
keep the liner warmer for better performance)
•
Ensure any equivalent flue liner is a listed
chimney liner system meeting type HT
requirements or other approved material.
I
NTERIOR CHIMNEY REQUIREMENTS
:
•
Must have at least 2" (51 mm) clearance to
combustible materials
•
Must install fire stops at the spaces where the
chimney passes through floors and/or ceiling
•
Any insulation material must be at least 2" (51
mm) from the chimney
E
XTERIOR CHIMNEY REQUIREMENTS
:
•
At least 1" (25 mm) clearance to combustible
materials
C
HIMNEY HEIGHT REQUIREMENTS
(S
EE
F
IGURE
9):
•
At least 3 feet (0.9 m) higher than the highest
part of the roof opening through which it passes.
•
At least 2 feet (0.6 m) higher than any part of the
roof within 10 feet (3 m) measured horizontally
from the top of the chimney.
The recommended minimum chimney height is 10
feet (3 m) off the floor. The recommended maximum
chimney height is 30 feet (9m).The Green Mountain
40 requires a draft between 0.06” and 0.1” water
column. Ensure your chimney is long enough to
provide the minimum draft, and use a damper if your
installation has a required chimney height that
provides too much draft.
3'-0"
MINIMUM
10'-0"
2'-0"
MINIMUM
3'-0"
MINIMUM
2'-0"
MINIMUM
Figure 8 – Chimney Height Requirements
