Downflow Furnace
Seal/Cat_lk I_
Around Pipe
at Building
\
\
\
\
\
\
90 ° Elbow _ \
\
\
f
Normal Snow Level
Vent _ _!3 9/1E"_
÷i 7,8
Combustion
Al ,oto,oO,po l i i
Straps or Other Suitable _ __-_j ___Z
Supports at Minimum of
5 ft. Intervals
' Top View
iq
Combustion Air
Intake Pipe
Offset with
Vent for Adequate
Dirnensiona_ C}eara#ce
Exhaust
Vent
PVC or
ABS pipe
Figure 16. Horizontal Venting
Support System
on Vertical Rise
Below Joints
¢//_ Vent
First support should be as
close to furnace es possible
Vent
Upward Pitch
t/4" per foot
.
Figure 17. Vertical Venting
Avoid areas where condensate drainage
may cause problems by dropping on plant_
ers or patios, etc. Also ensure that ex_
haust gases will not impinge on windows
or building surfaces, which may be com_
promised or damaged by condensation.
Do not install the vent terminal such that
exhaust is directed into window wells,
stairwells, under decks or into alcoves or
similar recessed areas, and do not termi-
nate above any public walkways.
6. Select the point of wall penetration where
the minimum I/4 inch per foot of slope up
can be maintained.
CAUTmON'.
For optimal performance vent furnace
through wall which experiences the least
exposure to winter winds.
17
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