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Hearth & Home Technologies • B41L-AU Installation Manual • 2570-980 Rev. C • 7/20
F. Vent Diagrams
Figure 4.8 Vent Cap
1/4 in. max.
(6 mm)
General Rules:
• 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 in. (6
mm) downward slant to allow any moisture in cap to be
released. See Figure 4.8.