Use Of Elbows - Heatilator NDV3630I-B Installation Manual

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 4.4.
Figure 4.5 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 4.4
Heatilator • NDV3630I-B, NDV3933I-B, NDV4236I-B, NDV4842I-B Installation Manual • 2382-980 Rev. G • 4/16
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
X
X
Vent
Type
Inches Millimeters
DVP 4-1/2
SLP 5
X
Vent Type
DVP
SLP
Figure 4.5 Vertical and Horizontal Offset for DVP and SLP Elbows
Note: Back to back 45 degree or 90 degree elbows have
no additional vertical or horizontal value and are not in-
cluded in determining maximum vent run lengths.
Y
Y
Inches Millimeters
114 17 432
127 11-3/4 298
X
X
Inches Millimeters
16-1/4 413
11-1/4 286
19