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D. Use of Elbows
Diagonal runs have both vertical and horizontal vent as-
pects when calculating the effects. Use the rise for the
vertical aspect and the run for the horizontal aspect. See
Figure 4.4.
Two 45º elbows may be used in place of one 90º elbow.
On 45º runs, one foot of diagonal is equal to 8-1/2 in. (216
mm) horizontal run and 8-1/2 in. (216 mm) vertical run. A
length of straight pipe is allowed between two 45º elbows.
See Figure 4.5.
Figure 4.6 shows the vertical and horizontal offsets for
DVP or SLP elbows.
VERTICAL
Effective Length
SLP
Pipe
Inches
Millimeters
SLP4
4
102
SLP6
6
152
SLP12
12
305
SLP24
24
610
SLP36
36
914
SLP48
48
1219
SLP6A
3 to 6
76 to 152
SLP12A
3 to 12
76 to 305
Effective Length
DVP
Pipe
Inches
Millimeters
DVP4
4
102
DVP6
6
152
DVP12
12
305
DVP24
24
610
DVP36
36
914
DVP48
48
1219
DVP6A
3 to 6
76 to 152
DVP12A
3 to 12
76 to 305
Figure 4.5
RUN
HORIZONTAL
Rise/Run
Inches
Millimeters
2-3/4
70
4-1/4
108
8-1/2
216
17
432
25-1/2
648
34
864
2-1/8-4-1/4
54-108
2-1/8-8-1/2
54-216
Rise/Run
Inches
Millimeters
2-3/4
70
4-1/4
108
8-1/2
216
17
432
25-1/2
648
34
864
2-1/8-4-1/4
54-108
2-1/8-8-1/2
54-216
Heat & Glo • 6000C-IFT, 8000C-IFT Installation Manual • 2502-980 Rev. M • 3/21
X
X
Vent
Type
Inches Millimeters
DVP
6-5/8
SLP
5-1/4
X
Vent Type
DVP
SLP
Figure 4.6 Vertical and Horizontal Offset for DVP and SLP Elbows
Y
Y
Inches
Millimeters
168
16-1/2
419
133
11-3/8
289
X
X
Inches
Millimeters
16-1/4
413
11-1/4
286
21
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