21
©
2014
Daikin
North
America,
LLC
Non
‐
Direct
Venting
A
90
degree
elbow
should
be
attached
to
the
furnace’s
combustion
air
intake
.
The
90
degree
elbow
will
guard
against
inadvertent
blockage
of
the
air
intake
.
©
2014
Daikin
North
America,
LLC
*DM96VC/*DC96VC
Direct
Vent
(2
‐
Pipe)
and
Non
‐
Direct Vent
(1
‐
Pipe)
(6)
Maximum
Allowable
Length
of
Vent/Flue
Pipe
&
Combustion
Air
Pipe
(ft)
(1)
(2)
Unit
Input
(Btu)
Pipe
Size
(4)
(in.)
Number
of
Elbows
(3)
(5)
1
2
3
4
5
6
7
8
40,000
2 or
2
1/2
120
115
110
105
100
95
90
85
60,000
2 or
2
1/2
95
90
85
80
75
70
65
60
80,000
"B"
2
or
2
1/2
75
70
65
60
55
50
45
40
80,000
"B"
3
200
193
186
179
172
165
158
151
80,000
"C"
2
or
2
1/2
25
20
15
10
5
N/A
N/A
N/A
80,000
"C"
3
200
193
186
179
172
165
158
151
100,000
2
or
2
1/2
25
20
15
10
5
N/A
N/A
N/A
100,000
3
200
193
186
179
172
165
158
151
120,000
2
or
2
1/2
45
40
35
30
25
20
15
10
120,000
3
95
90
85
80
75
70
65
60
Pipe
Lengths,
Diameters,
and
Elbows
Allowed
Refer
to
the
table
in
each
manual
for
applicable
length,
elbows,
and
pipe
diameter
for
construction
of
the
vent/
flue
pipe
system
.
Elbows
and/
or
tees
used
in
the
terminations
must
be
included
when
determining
the
number
of
elbows
in
the
pipe
system.
