Installation
11
│
Page
‐
Exhaust
vent
(PVC
&
ABS
vent)
‐
The
T
‐
H2
‐
DV
can
be
connected
with
PVC
or
ABS
venting
(temperature
rated
up
to
149°F).
However,
TAKAGI
recommends
PVC
(or
ABS)
venting
certified
to
ULC
S636
standards.
Item
Material
United
States
Canada
Exhaust
pipe
&
Fittings
Schedule
40
PVC
ANSI/ASTM
D1785
ULC
S636
Certified
Materials
Only
PVC
‐
DWV
ANSI/ASTM
D2665
Schedule
40
CPVC
ANSI/ASTM
F441
Schedule
40
ABS
‐
DWV
ANSI/ASTM
D2661
Pipe
Cement/Primer
PVC
ANSI/ASTM
D2564
CPVC
ANSI/ASTM
F493
ABS
ANSI/ASTM
D2235
NOTE:
Do
NOT
Use
Cellular
Foam
Core
Pipe
•
The
maximum
length
of
exhaust
vent
piping
must
not
exceed
50
ft.
(deducting
5
ft.
for
each
elbow
used
in
the
venting
system).
Do
not
use
more
than
5
elbows.
•
When
the
horizontal
vent
run
exceeds
5
ft.,
support
the
vent
run
at
3
ft.
intervals
with
overhead
hangars.
Diameter
Max.
No.
of
Elbow
Max.
Vertical
&
Horizontal
(Total)
Vent
Length
4”
5
50
ft.
*For
each
elbow
added,
deduct
5
ft.
from
max.
Vent
length.
No.
of
Elbows
Max.
Vertical
or
Horizontal
Length
0
50
ft.
1
45
ft.
2
40
ft.
5
25
ft.
For
details
on
the
vent
connection
to
the
T
‐
H2
‐
DV,
refer
to
P.13.
‐
Exhaust
vent
(Stainless
steel
vent)
‐
This
is
a
Category
IV
appliance
and
must
be
vented
accordingly.
The
vent
system
must
be
sealed
air
tight.
All
seams
and
joints
without
gaskets
must
be
sealed
with
high
heat
resistant
silicone
sealant
or
UL
listed
aluminum
adhesive
tape
having
a
minimum
temperature
rating
of
160°F.
For
best
results,
a
vent
system
should
be
as
short
and
straight
as
possible.
•
This
T
‐
H2
‐
DV
is
a
Category
IV
appliance
and
must
be
vented
accordingly
with
any
4”
vent
approved
for
use
with
Category
III
/
IV
or
Special
BH
type
gas
vent.
•
TAKAGI
recommends
the
“T
‐
Vent”
line
manufactured
by
TAKAGI
(Refer
to
Takagi’s
“T
‐
Vent”
brochure
for
details).
However,
the
following
are
also
UL
listed
manufacturers:
ProTech
Systems
Inc.
(FasNSeal),
Flex
‐
L
Inc.,
Z
‐
Flex
Inc.
(Z
‐
Vent
III),
Metal
‐
Fab
Inc.,
and
Heat
‐
Fab
Inc.
(Saf
‐
T
Vent).
•
Follow
the
vent
pipe
manufacturer’s
instructions
when
installing
the
vent
pipe.