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Heat & Glo • REVO-V12, REVO-S21, REVO-H31 Installation Manual • 2273-980 Rev. J • 5/15
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 13.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.
General Rules:
• 90º elbows can be replaced with two 45º elbows.
• 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 configuration. Some elbows may be
installed horizontally. See Figure 4.9 and Figure 4.12 .
• When penetrating a combustible wall, a wall shield
firestop must be installed. See Figure 5.1.
• When penetrating a combustible ceiling, a ceiling firestop
must be installed. See Figure 5.4.
• 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 4.6.
F. Vent Diagrams
