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Figure 21
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
22 is 22 feet.
Attention: Refer to Figure 17 for additional venting
requirements.
Figure 22
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. It
allows installation depth down to 7" (178 mm) below grade level.
The 7" (178 mm) 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.
TYPICAL BASEMENT INSTALLATION
Figure 20
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.
FIRESTOPAT
CEILINGLEVEL
SEEGRAPH FOR PERMISSIBLE “H” AND “V” DIMENSIONS
NOTE:H1 AND H2 MUST BE ADDED TOGETHER TO USE CHART
SEEGRAPH FOR PERMISSIBLE “H” AND “V” DIMENSIONS
FIRESTOPAT
CEILINGLEVEL