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E. 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 (Figure 12.1 for DVP, Figure
12.8 for SLP) for information on effective length of pipe
components.
• Horizontal terminations are measured to the outside
mounting surface (fl ange of termination cap) (see Figure
4.6).
• Vertical terminations are measured to top of last section
of pipe. See Figure 4.7.
• Horizontal pipe installed level with no rise.
Figure 4.6 Measure to Outside Mounting Surface
Figure 4.7. Measure to Top of Last Section of Pipe
20
MEASURE TO SHADED SURFACE
(OUTSIDE MOUNTING SURFACE)
Heatilator • GDST4336IFT, GDFL4136IFT Installation Manual • 2480-980 Rev. B • 3/17
F. Vent Diagrams
To replace the fi rst starter elbow with two 45° elbows,
refer to Figure 4.8. All other 90° elbows can be replaced
with two 45° elbows.
General Rules:
• SUBTRACT 3 ft. from the total H measurement for each
90º elbow installed horizontally.
• SUBTRACT 1-1/2 ft. from the total H measurement for
each 45º elbow installed horizontally.
• A maximum of three 90º elbows (or six 45º elbows) may
be used in any vent confi guration. Some elbows may be
installed horizontally.
• Elbows may be placed back to back anywhere in the
system.
•
Any 90º elbow may be replaced with two back to back
45º elbows.
• When penetrating a combustible wall, a wall shield
fi restop must be installed.
• When penetrating a combustible ceiling, a ceiling fi restop
must be installed.
• Horizontal runs of vent do not require vertical rise;
horizontal runs may be level.
• Horizontal termination cap should have a 1/4 inch
downward slant to allow any moisture in cap to be
released. See Figure 4.8.
Top Vent
Horizontal Termination
Two 45° Elbows
Installation requirements to replace the fi rst 90° elbow
with two 45° elbows:
1/4 in. max.
(6 mm)
16 ft max.
Note: Reference Figure 4.21 for
special instructions for use of 45º
elbow on rear vent appliances.
Figure 4.8
4 ft min.
(1.22 m)
(4.87 m)
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