Matrix
Insert
Installation
and
Operation
Manual
______________________________________________________________________________
47
9.8
SUPPLY
OF
COMBUSTION
AIR
In
Canada,
wood
inserts
are
not
required
to
have
a
supply
of
combustion
air
from
outdoors
because
research
has
shown
that
these
supplies
do
not
give
protection
against
house
depressurization
and
may
fail
to
supply
combustion
air
during
windy
weather.
However,
to
protect
against
the
risk
of
smoke
spillage
due
to
house
depressurization,
a
carbon
monoxide
(CO)
detector/alarm
is
required
in
the
room
in
which
the
insert
is
installed.
The
CO
detector
will
provide
warning
if
for
any
reason
the
wood
insert
fails
to
function
correctly.
9.8.1
AIR
SUPPLY
IN
CONVENTIONAL
HOUSES
The
safest
and
most
reliable
supply
of
combustion
air
for
your
wood
insert
is
from
the
room
in
which
it
is
installed.
Room
air
is
already
preheated
so
it
will
not
chill
the
fire,
and
its
availability
is
not
affected
by
wind
pressures
on
the
house.
Contrary
to
commonly
expressed
concerns,
almost
all
tightly
‐
sealed
new
houses
have
enough
natural
leakage
to
provide
the
small
amount
of
air
needed
by
the
insert.
The
only
case
in
which
the
wood
insert
may
not
have
adequate
access
to
combustion
air
is
if
the
operation
of
a
powerful
exhaust
device
(such
as
a
kitchen
range
exhaust)
causes
the
pressure
in
the
house
to
become
negative
relative
to
outdoors.
If
you
do
install
an
air
supply
through
the
wall
of
the
house,
be
aware
that
its
pressure
can
be
affected
during
windy
weather.
If
you
notice
changes
in
wood
insert
performance
in
windy
weather,
and
in
particular
if
smoke
puffs
from
the
insert,
you
should
disconnect
the
outdoor
air
duct
from
the
insert
and
remove
the
duct.
In
some
windy
conditions,
negative
pressure
at
the
duct
weatherhood
outside
the
house
wall
may
draw
hot
exhaust
gases
from
the
insert
backwards
through
the
duct
to
outdoors.
Check
the
outdoor
air
duct
for
soot
deposits
when
the
full
system
is
cleaned
and
inspected
at
least
once
each
year.
