ECR International G95V Installation Manual And Operating Instructions page 19

All exhaust piping must be installed in accordance
with CAN/CGA-B149.in Canada; the latest edition
of National Fuel Gas Code, NFPA 54 / ANSI Z223.1
in the United States, as well as in accordance with
local codes.
Size the combustion air and exhaust piping in ac-
cordance with Table 4. When calculating allowable
vent lengths, be sure to count all termination fit-
tings in addition to counting the concentric vent as
a straight pipe.
Take the building orientation and the presence of
other buildings or other nearby structures into con-
sideration when planning the venting system loca-
tion. Certain external structures could create air
turbulence around the vent termination leading to
downdrafts and similar venting problems. In windy
and hill locations, roof venting may improve opera-
tions. Maximum venting length is based on 30 mph
winds, areas where higher gusts are dominant it is
suggest to shorten the horizontal vent length.
The vent and combustion air intake shall be in-
stalled so that both are located in the same wind
pressure zone.
TABLE 4 - DIRECT AND NON-DIRECT VENT LENGTHS
MAXIMUM ALLOWABLE LENGTH OF EXHAUST OR INTAKE. MINIMUM VENT LENGTH - 25 TOTAL EQUIVALENT FEET.
PIPE
MODEL
SIZE
0
1½ 25
60 2 75
3 100
2 50
80
3 100
2 50
100
3 100
120 3 100
When 1½" or 3" pipe is used, exit the cabinet with 2" pipe. Reduce or increase immediately after exiting the
cabinet making provisions to secure the vent bracket between cabinet and fitting.
Use of a concentric termination reduces the allowable length by 5 feet from lengths shown in this table.
NUMBER OF 90° ELBOWS
1 2 3
20 15 10
70 65 60
95 90 85
45 40 35
95 90 85
45 40 35
95 90 85
95 90 85
FIGURE 8 - STANDARD (STRAIGHT) HORIZON-
TAL VENT DETAIL
!
DO NOT CONNECT FURNACE TO A CHIMNEY
OR FLUE SERVING OTHER APPLIANCES OR A
SOLID FUEL BURNING APPLIANCE
VENT TERMINATION
Horizontal vents should pass through the exterior
wall. Figure 8 shows a standard horizontal vent de-
tail. Terminate the vent approximately 8" or more
from the wall.
4 5 6
1.
5 - -
2.
55 50 45
3.
80 75 70
4.
30 25 20
80 75 70
5.
30 25 20
80 75 70
6.
80 75 70
19
!
WARNING
NOTES
Count concentric vent fitting as
straight pipe.
Use medium or long sweep
elbows where possible.
One 90° elbow is equivalent to
two 45° elbows.
For direct vent, the listed lengths
are allowed for each vent (intake
and exhaust).
For non-direct vent, the listed
lengths are allowed for exhaust.
The intake should have a 1½"
or 2" snorkel intake fitting.
(Figure 7)
Include the 2 vestibule elbows
when calculating total vent length
for all models.