A. F
RESH AIR TO BUILDING DUCT ONLY
•
Cut
an
opening
into
the
return
duct
not
less
than
10
feet
(
3.1
m
)
from
the
furnace
(
A
+
B
)
.
•
Use
a
metal
transition
(
not
provided,
available
in
hardware
stores
)
to
connect
the
fresh
air
to
building
duct
to
the
furnace
return
duct.
N
O
TE
:F
or
this
type
of
installation,
it
is
not
essential
that
the
furnace
blower
runs
when
the
unit
is
in
operation,
but
we
recommend
it.
4.6 I
NSTALLING
N
ON
-I
NSULATED
F
LEXIBLE
D
UCTS AND
R
EGISTERS
(
CONT
’
D
)
VJ00
6
5
B
A
4.6.4 C
ONNECTION TO A
F
ORCED
A
IR
S
YSTEM
10
4.
UNIT INSTALLATION
(CONT’D)
WARNING
When performing duct connections, always use approved tools and
materials. Respect all corresponding laws and safety regulations. Please
refer to your local building code.
0
!
M
ETAL
TRANSITION
B. F
RESH AIR TO BUILDING DUCT AND EXHAUST AIR FROM BUILDING DUCTS
Fresh air to building duct
•
See
point
A
above
“F
resh
air
to
building
duct
only
”
.
Exhaust air from building duct
•
Cut
an
opening
into
the
return
duct
at
least
at
3
feet
(
0.9 m
)
from
the
fresh
air
to
building
duct
connection
to
the
return
plenum.
•
Use
a
metal
transition
(
not
provided,
available
in
hardware
stores
)
to
connect
the
stale
air
inta
k
e
duct
to
the
furnace
return
duct.
B
A
VJ00
6
8
WARNING
When performing duct connections, always use approved tools and
materials. Respect all corresponding laws and safety regulations. Please
refer to your local building code.
0
!
CAUTION
For this type of installation, the furnace blower must be in operation when
the HRV is in operation.
A+B =
NOT LESS
THAN
10’ (3.1
M
)
A+B =
NOT LESS
THAN
10’ (3.1
M
)
M
INIMUM
3’
(0.9
M
)
M
ETAL
TRANSITION
Содержание PRO225
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