6
WS-415-090 / 04.03.00
A terminal shall not terminate directly above a sidewalk
or paved driveway which is located betweeen two single
family dwellings and serves both dwellings. Local
codes or regulations may require different clearances.
Do not allow the inside liner to bunch up on horizontal or
vertical runs and elbows. Keep it pulled tight. A 1¼" air
gap all around between the inner liner and outer liner is
required for safe operation. Use a firestop when pen-
etrating interior walls, floor or ceiling.
CALCULATED HORIZONTAL VENT RUN IN FEET
REQUIRED VERTI-
CAL RISE FROM
FIREPLACE TO
FIRST ELBOW IN
INCHES
FIGURE 4
B
C
A
FIGURE 5
Use the chart on this page to calculate horizontal runs for
vertical rises between 10 and 57 inches.
FIGURE 4.
When calculating maximum run lengths, include 5 feet for
each 90° or 45° elbow.
(DO NOT INCLUDE THE FIRST ELBOW DIRECTLY OFF
THE UNIT.)
SPECIAL INSTALLATION EXAMPLE
When a horizontal offset is
required in a through-the-
roof installation, the follow-
ing procedure for vent
length calculations must be
followed:
In an installation as shown
in
FIGURE 5,
lengths A and
C are known based on
room height and roof re-
quirements.
Any 90° and
45° elbows must be calcu-
lated as 5 feet of venting
each
except for the one im-
except for the one im-
except for the one im-
except for the one im-
except for the one im-
mediately at the fireplace
mediately at the fireplace
mediately at the fireplace
mediately at the fireplace
mediately at the fireplace
which is excluded
which is excluded
which is excluded
which is excluded
which is excluded
.
The allowable horizontal run can be calculated using these
parameters. In this example, the total vertical height is 20
feet (length "A" is required to be 11 feet while length "C"
needs to be 9 feet). The maximum vertical length is 40 feet
and all runs and elbows must be subtracted from this maxi-
mum vertical length.
The maximum allowable horizontal run that "B" can be is:
40 ft. (maximum vertical run length)
-
11 ft. (through the roof vertical rise
"A"
)
-10 ft. (2 - 90° elbow)
- 9 ft. (vertical run
"C"
)
10 ft. (maximum allowable horizontal length for
"B"
)
The length of "B" must never be greater than the length
of "A" and "C" combined.
Summary of Contents for GD27 - N
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