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Common Vent Length Table [Total
Length (L) = W + H]
Vent Length for NHB-H Boiler Units
Required
Model
Load
110/150H D=3" D=4" D=6" D=8"
(Total BTU/H)
300,000
2
450,000
3
600,000
4
750,000
5
900,000
6
1,050,000
7
1,200,000
8
Every 90° elbow used is equivalent to
Note
●
8 linear feet (2.4 m) of vent length.
Branch pipe lengths are not added
●
to the allowable equivable vent
lengths that are provided in the
following charts.
Example of a Typical Installation
The following illustration depicts an example of a
common vent system installed for a cascade system
of 8 Navien NHB-H boiler units.
The illustration is intended for
Note
reference purposes only.
82
Installing a Common Vent System
Total Length (ft)
60
106
200
40
71
160
30
53
120
24
42
96
150
35
80
142
30
68
121
26
60
106
9.2 Navien Common Vent Collar
Kit (Back-draft Damper)
The Navien Common Vent Collar Kit includes a
backdraft damper preventing the flue gases and
cold outside air from entering the boiler when the
combustion fan is off. The kit includes the cascade
cable.
By closing the exhaust vent as soon as the
combustion cycle ends, the Navien Common Vent
Collar Kit retains heat in the system for longer
periods.
Included Items
Common Vent Collar
Kit
Installation Manual
Ready-Link
communication
cable
Screw (4 ea)
VID jumper wire
Specifications
Part Name
Part No.
Material
Con den
sing Wat
er Hea
Co m m
ter
on Ve nt
In sta lla
Sy ste m
tio n M
For NP
an ua l
E Ser ies
Wa ter
He ate rs
Certi ed
to ANSI
Keep this
Z21.10
manua
.3 – CSA
4.3. (Only
require
d.
l for future
for U.S.
referen
ce whene
installa
tions)
ver mainte
nance
or service
WAR NING
is
If the inform
injury,
or death.
ation in
these instruc
tions is
-
Do not
not follow
store or
use gasoli
ed exactl
-
WHAT
ne or other
y, a re
or explos
TO DO
IF YOU
amma
ion may
Do not
try to light
SMELL
ble vapor
result,
causin
Do not
any applia
GAS
s and liquid
g prope
touch
any electr
nce.
s in the
vicinit
rty
damag
e, person
Imme diately
ical switch
y of this
al
call your
; do not
or any
other applia
If you canno
gas suppl
use any
nce.
Install
t reach
your gas
ier from
a neigh
phone
in your
-
ation and
suppl ier,
bor's phone
buildi ng.
servic
e must
call the
. Follow
-
This entire
manu
be perfor
re depar
the gas
maint
enanc
al must
med by
tment .
suppli er's
instru ctions
e of the
comm
be left
for the
a quali
ed install
-
The install
on vent
consu
mer. The
er, servic
.
ANSI Z223.1
ation must
system
.
consu
e agenc
y or the
/NFPA
confor
m with
mer must
gas suppli
-
When
54.
local codes
read and
refer to
er.
Stand
applic
able, the
or, in the
this manua
ard, Title
install
ation must
absen
ce of local
l for prope
24 CFR,
Part 3280,
confor
codes
r opera
Mobil
m with
, the Nation
tion and
e Home
s.
the Manuf
al Fuel
Gas Code,
acture
d Home
Constr
uction
and Safety
5.9" (150 mm)
1.1" (28 mm)
Common Vent Collar Kit
30014367*
PP (Polypropylene)
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