29
Majestic • MER36MN, MER42MN Installation Manual • 2599-980 Rev. B • 5/23
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.
Figure 4.6
HORIZONTAL
VERTICAL
RUN
RIS
E
EF
FE
CT
IVE
LE
NG
TH
Y
X
X
X
DVP
Pipe
Effective Length
Rise/Run
Inches
Millimeters
Inches
Millimeters
DVP4
4
102
2-3/4
70
DVP6
6
152
4-1/4
108
DVP12
12
305
8-1/2
216
DVP24
24
610
17
432
DVP36
36
914
25-1/2
648
DVP48
48
1219
34
864
DVP6A
3 to 6
76 to 152
2-1/8-4-1/4
54-108
DVP12A 3 to 12
76 to 305
2-1/8-8-1/2
54-216
Vent Type
X
Inches
Millimeters
DVP
16-1/4
413
SLP
11-1/4
286
Figure 4.7 Vertical and Horizontal Offset for DVP and SLP Elbows
SLP
Pipe
Effective Length
Rise/Run
Inches
Millimeters
Inches
Millimeters
SLP4
4
102
2-3/4
70
SLP6
6
152
4-1/4
108
SLP12
12
305
8-1/2
216
SLP24
24
610
17
432
SLP36
36
914
25-1/2
648
SLP48
48
1219
34
864
SLP6A
3 to 6
76 to 152
2-1/8-4-1/4
54-108
SLP12A 3 to 12
76 to 305
2-1/8-8-1/2
54-216
Vent
Type
X
Y
Inches Millimeters Inches Millimeters
DVP
6-5/8
168
16-1/2
419
SLP
5-1/4
133
11-3/8
289
