Vertical Termination Of Combustion Air And Exhaust Vent - Fedders FV95A054 Installating And Operation Manual

VERTICAL TERMINATION OF
COMBUSTION AIR
AND EXHAUST VENT
Vertical Combustion Air Termination
The combustion air termination is a pair of 2" medium or
long sweep 90° elbows pointing downward to prevent rain
from entering the combustion air intake piping.
If 3" piping is used, it should be reduced to 2" within 18"
of the point where the pipe penetrates the roof. The ter-
mination inlet must be positioned within 3" of the com-
panion exhaust piping.
The combustion air inlet must be located a minimum of
12" above the anticipated snow level, and 12" below the
exhaust outlet.
A
Vertical Exhaust Vent Termination
The exhaust vent may terminate in a vertical venting
configuration through the roof.
B
No termination fitting is required if venting vertically
through a roof. The end of the exhaust pipe must be 12"
higher than the entrance of the combustion air intake
terminal.
C
The exhaust pipe extending through the roof must extend
a minimum of 18" above any obstruction within an 18"
horizontal distance.
E
D
C
A COMBUSTION AIR
B EXHAUST
C 8"
D
12"
E
2"
F
12" CLEARANCE ABOVE GRADE OR
G
HIGHEST ANTICIPATED SNOW LEVEL.
H
I
K
J
L
B
C
E
D
C
B
A
B
A
F
F
MULTIPLE VENTING
When installing multiple furnaces in close proximity,
each requires dedicated combustion air and exhaust
venting.
COMMON VENTING IS PROHIBITED
If two of these furnaces are to be installed in close proximi-
ty, the combustion air intake and exhaust terminations may
be installed as shown in Figures 10.
If more than two furnaces are being installed in close prox-
J
imity, each additional combustion air intake and exhaust
termination set must be installed a minimum of 4 feet
apart. This is an exception to the 10 foot requirement men-
D
C
tioned in the "Location" section on the previous page. If
using the concentric venting kits, two terminals may be
centered 12 inches apart.
A
B
Figure 10
F
A
I
J
C
A COMBUSTION AIR
B EXHAUST
D
C 8"
D
12"
E
2"
F
12" CLEARANCE ABOVE GRADE OR
G
HIGHEST ANTICIPATED SNOW LEVEL.
H
8"
C
I
K
D
J
L
A
A
B
G
F
21
A
B
E
IMPORTANT
A
B
WARNING
I
INTERIOR
E
EXTERIOR
C
D
G
E
D
H
TOP VIEW
B
INTERIOR
E
EXTERIOR
E
B
D
H
TOP VIEW
D
A
B
D
A