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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 4.6.
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 inch
(216 mm) horizontal run and 8-1/2 inch (216 mm) vertical
run. A length of straight pipe is allowed between two 45º
elbows. See Figure 4.6.
Figure 4.7 shows the vertical and horizontal offsets for
DVP or SLP elbows.
VERTICAL
Effective Length
DVP
Pipe
Inches
Millimeters
DVP4
4
DVP6
6
DVP12
12
DVP24
24
DVP36
36
DVP48
48
1219
DVP6A
3 to 6
76 to 152
DVP12A
3 to 12
76 to 305
Figure 4.6
RUN
HORIZONTAL
Rise/Run
Inches
Millimeters
102
2-3/4
152
4-1/4
108
305
8-1/2
216
610
17
432
914
25-1/2
648
34
864
2-1/8-4-1/4
54-108
2-1/8-8-1/2
54-216
Heat & Glo • 6KX-AU Installation Manual • 2589-980 Rev. B • 5/23
Vent
Type
DVP
Vent Type
70
Figure 4.7 Vertical and Horizontal Offset for DVP and SLP Elbows
X
X
Inches
Millimeters
6-5/8
168
X
Inches
DVP
16-1/4
Y
Y
Inches
Millimeters
16-1/2
419
X
X
Millimeters
413
27
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