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38714-5-0920
Page 21
SEE GRAPH FOR PERMISSIBLE “H” AND “V” DIMENSIONS
FIRESTOP AT
CEILING LEVEL
Figure 24
Examples of possible venting systems using two (2) 90° elbows.
V is listed as minimum vertical dimensions and H1 + H2 is listed
as total of maximum horizontal dimensions. The maximum vertical
and horizontal distances for two (2) 90° elbows as shown in Figure
25 is 20 feet.
Attention: Refer to
Figure 22
for additional venting requirements.
FIRESTOP AT
CEILING LEVEL
1
SEE GRAPH FOR PERMISSIBLE “H” AND “V” DIMENSIONS
NOTE: H1 AND H2 MUST BE ADDED TOGETHER TO USE CHART
Figure 25
Below Grade Installation
When it is not possible to meet the required vent terminal clearances
of 12" (305mm) above grade level, a snorkel kit is recommended.
See page 38. It allows installation depth down to 7" (178mm) below
grade level. The 7" (178mm) is measured from the center of the
horizontal vent pipe as it penetrates through the wall.
Ensure the sidewall venting clearances are observed. If venting
system is installed below ground, we recommend a window well
with adequate and proper drainage to be installed around the
termination area.
COMBUSTIBLE
PROJECTION
18” (457mm)
MINIMUM
12” (305mm)
ABOVE GRADE
48”
(1219mm)
PIPE STRAP
3” (76mm)
MINIMUM
TYPICAL BASEMENT INSTALLATION
Figure 23
Examples of possible venting systems using one (1) 90° elbow.
Eight (8) feet is listed as minimum vertical vent run with 20 feet of
maximum horizontal vent run. Vertical dimensions are based on
centerline to centerline of pipe. Horizontal dimensions are based
on centerline of pipe to end of termination.
VENTING FIREPLACE - TOP (CONT'D)