Measuring Vent Length - Navien NCB-190/060H Installation & Operation Manual

Hart & Cooley Polyflue™ SW (Rigid)
2PF-xx (2") or 3PF-xx (3")
Z-Flex Z-DENS SW (Rigid)
2ZDP___ (2" or 3")
The following stainless steel vent components are
approved for use with this appliance:
Duravent FasNSeal® (Rigid)
FSA-PVC3 (3" PVC to FasN Seal Appliance Adapter)
FSxxxxx03 (3")
Duravent FasNSeal® (Flexible)
FSASMM-PP-2 (2" PP-to-F asNSeal adapter)
FSFLEX-02 (2")
Heat Fab Saf-T Vent® EZ Seal
9301PVC (3" PVC/CPVC Outlet Boiler Adapter)
93xx (3")
Z-Flex Z Vent
2SVSTTA023 (2" x 3" Appliance Adapter)
2SVEPSCF030X (Straight Pipe)
2SVEEWCF0390 (90° Elbow)
2SVEEWCF0345 (45° Elbow)
Only the vent pipe models listed
Note
●
above are approved for use with this
appliance.
Proper appliance adapters must be
●
used when using polypropylene or
SS vent pipe.
Refer to the vent manufacturer's
●
instructions for detailed installation
procedures and guidelines.
Do not use Schedule 40 or 80
●
polypropylene pipe used for water or
waste systems within the vent run.

5.5 Measuring Vent Length

The maximum vent length when using 2 in exhaust
ducts is 65 ft (20 m). The maximum vent length
when using 3 in vent ducts is 150 ft (45 m). The
intake duct length may be identical to the exhaust
duct length. Maximum vent lengths reduce
according to the number of elbows used, as shown
in the following table:
Vent Maximum Maximum
Size Length # of Elbows
65 ft
2 in 6
(19.5 m)
150 ft
3 in 8
(45 m)
The Maximum Length does not
Note
●
include any elbows.
The use of a PVC or polypropylene
●
termination kit counts as 5 linear feet
(1.5 m) of vent.
The use of a tee counts for the same
●
equivalent length as a 90° elbow for
the vent size.
The maximum vent lengths at high
●
altitudes are the same as shown in the
table above.
Equivalent Length
Reduce the
maximum vent
length accordingly
for each elbow used:
Each 90° elbow
●
equates to 8 linear
feet of vent
Each 45° elbow
●
equates to 4 linear
feet of vent
Reduce the
maximum vent
length accordingly
for each elbow used:
Each 90° elbow
●
equates to 5 linear
feet of vent
Each 45° elbow
●
equates to 3 linear
feet of vent
Venting for Combustion Air 67