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33
Venting and Combustion Air Installation
The maximum equivalent length is the
total length of the venting and the com-
bustion air inlet combined. This includes
termination fittings.
F o r Delta PERFORMANCE PLUS
applications that may exceed the 100 feet
maximum allowable equivalent length
for the venting system, contact Triangle
Tube Engineering Department for addi-
tional information on how the appliance
can be adjusted to the application.
- For each elbow included in the system,
the maximum allowable linear length
must be reduced as follows:
• Each 90º elbow within the system is
the equivalent of 10 linear feet.
• Each 45º elbow within the system is
the equivalent of 5 linear feet.
It is recommended that the installer uses the
same number of elbows and length of piping on
the venting system and the combustion air
inlet.
NOTICE
NOTICE
Table 2- Allowable Equivalent Length (Combined Vent and Combustion Air)
Maximum
Allowable for
Linear Length Combined 2 3 4 5 6 7
PERFORMANCE PLUS 180 170 160 150 140 130
Total Elbows within the Venting / Combustion Air System
Fig. 19: Standard Ve rtical Venting Installation Fig. 20: Ve r tical - Direct Vent Combination