Heatilator • RAVE32-IFT-B, RAVE36-IFT-B, RAVE42-IFT-B Installation Manual • 2619-983 Rev. U • 9/22
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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 configuration unless configured as
shown in Figure 4.20 which allows four elbows. Some
elbows may be installed horizontally. See Figure 4.15.
• 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
firestop must be installed.
• When penetrating a combustible ceiling, a ceiling firestop
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 4.11.
F. Vent Diagrams
Figure 4.11 Vent Cap
1/4 in. max.
(6 mm)
