Majestic MARQ36IN-B, MARQ42IN-B Installation Manual • 2614-980 Rev. D • 4/19
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E. Use of Elbows
Diagonal runs have both vertical and horizontal vent
aspects when calculating the effects. Use the rise for the
vertical aspect and the run for the horizontal aspect. See
Figure 4.5.
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 elbows.
Figure 4.5
HORIZONTAL
VERTICAL
RUN
RIS
E
EF
FE
CT
IVE
LE
NG
TH
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
Y
X
X
X
Vent Type
X
Inches
Millimeters
DVP
16-1/4
413
Figure 4.6 Vertical and Horizontal Offset for DVP Elbows
Vent
Type
X
Y
Inches Millimeters Inches Millimeters
DVP
4-1/2
114
17
432
F. Measuring Standards
Vertical and horizontal measurements listed in the vent
diagrams were made using the following standards:
• Pipe measurements are shown using the effective length
of pipe. See Section 12.A for information on effective
length of pipe components.
• Horizontal terminations are measured to the outside
mounting surface (flange of termination cap) (see Figure
4.3).
• Vertical terminations are measured to bottom of
termination cap.
• Horizontal pipe installed level with no rise.
