HearthStone Heritage 8021 Owner's Manual page 14

chimney will cool, your stove will perform poorly,
and creosote will build up in the chimney.
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 an 8" x 8" (203 mm x 203
mm) tile size for best results. An oversized flue will
contribute to the accumulation of creosote.
Minimum Requirements:
Use the following checklist to ensure that your
masonry chimney
requirements:
Chimney wall construction:

Brick or modular block at least 4" (102 mm)
thick.

A rubble or stone wall at least 12" (305mm)
thick.
Flue liner:

Minimum thickness of 5/8" (16 mm).

Installed with refractory mortar.

At least 1" (25 mm) air space.

An equivalent flue liner must be a listed
chimney liner system meeting type HT
requirements or other approved material.
Hearthstone Quality Home Heating Products, Inc. ®
meets these minimum
Figure 10 – The 2-3-10 Rule
Interior chimney requirements:

At least 2" (51 mm) clearance to combustible
structure

Fire stops must be installed at the spaces where
the chimney passes through floors and/or ceiling.

Insulation must be 2" (51 mm) from the chimney.
Exterior chimney requirements:

At least 1" (25 mm) clearance to combustible
structure.
Chimney height requirements for both
prefabricated metal and masonry chimneys: (See
Figure 13)

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.
This stove requires a minimum chimney height of 13
feet (4 m). The maximum allowable chimney height
is 30 feet (9m).
Page 14 of 30
Heritage Model 8021