Product Manual

HeatPack Furnace Installation and Operation Manual
15
Recommended installation
Inside chimneys are recommended
because even when no fire is burning, there
is normally an upward flow in the system.
Not recommended installation
An outside chimney will create problems
because it creates a cold backdraft, if the
furnace is installed in the lower part of the
house.
6.1.2 Masonry chimneys
The furnace may also be connected to a masonry chimney, provided the chimney
complies with the construction rules found in the building code enforced locally.
 The chimney must have a clay liner.
 If the masonry chimney has a
square or rectangular liner that is
larger in cross sectional area than a
round 6" (152 mm) flue, it should be
relined with a listed 6" (152 mm)
stainless steel liner.
 When passing through a
combustible wall, the use of wall
thimble is required.
 If a stainless steel jacket (liner) is to
be installed, it must extend 12"
(305 mm) to 18" (457 mm) above
the top of the masonry chimney to
improve draught.
6.1.3 Minimum chimney height
The top of the chimney should be tall enough to be above the air turbulence caused when
wind blows against the house and its roof.
 The chimney must extend at least 3 ft. (1 m) above the highest point of contact with the
roof.
 Extend at least 2 ft. (61 cm) higher than any roof line or obstacle within a horizontal
distance of 10 ft. (3 m).