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HE200 - Installation and Operation Manual
53
8
THE
VENTING
SYSTEM
8.1
General
The
venting
system,
acts
as
the
engine
that
drives
your
wood
heating
system.
Even
the
best
fireplace
will
not
function
safely
and
efficiently
as
intended
if
it
is
not
connected
to
a
suitable
chimney.
The
heat
in
the
flue
gases
that
pass
from
the
fireplace
into
the
chimney
is
not
waste
heat.
This
heat
is
what
the
chimney
uses
to
make
the
draft
that
draws
in
combustion
air,
keeps
smoke
inside
the
fireplace
and
safely
vents
exhaust
to
outside.
You
can
think
of
heat
in
the
flue
gas
as
the
fuel
the
chimney
uses
to
make
draft.
8.2
Suitable
Chimneys
Your
wood
fireplace
will
provide
optimum
efficiency
and
performance
when
connected
to
a
6
‐
inch
diameter
chimney.
8.3
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
1
m
(3
ft.)
above
the
highest
point
of
contact
with
the
roof,
and
at
least
60
cm
(2
ft.)
higher
than
any
roof
line
or
obstacle
within
a
horizontal
distance
of
3
m
(10
ft.).
8.4
The
Relationship
Between
the
Chimney
and
the
House
Because
the
venting
system
is
the
engine
that
drives
the
wood
heating
system,
it
must
have
the
right
characteristics.
The
signs
of
bad
system
design
are
cold
backdrafting
when
there
is
no
fire
in
the
fireplace,
slow
kindling
of
new
fires,
and
smoke
roll
‐
out
when
the
door
is
opened
for
loading.
8.4.1
Why
the
chimney
should
penetrate
the
highest
heated
space
When
it
is
cold
outside,
the
warm
air
in
the
house
is
buoyant
so
it
tends
to
rise.
This
tendency
of
warm
air
to
rise
creates
a
slight
pressure
difference
in
the
house.
Called
‘stack
effect’,
it
produces
a
slightly
negative
pressure
low
in
the
house
(relative
to
outside)
and
a
slightly
positive
pressure
zone
high
in
the
house.
If
there
is
no
fire
burning
in
a
heater
connected
to
a
chimney
that
is
shorter
than
the
warm
space
inside
the
house,
the
slight
negative
pressure
low
in
the
house
will
compete
against
the
desired
upward
flow
in
the
chimney.
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