Navien NFB-301C - Dimensions

11About the Boiler
1.5 Dimensions
The following diagrams show the dimensions of the boiler and the table lists the supply connections.
32.8" (835 mm)
Supply Connections
Description
Diameter
NFB-301C NFB-399C
A Air Intake 3 in
B Exhaust Gas Vent 3 in
C
PRV-Air Vent Connection
(Optional Heating Supply)
1
1
/
4
in 1
1
/ in
D Optional Heating Return 1
1
/
4
in 1
1
/ in
E Heating Supply 1
1
/
4
in 1
1
/ in
F Condensate Outlet
3
/
4
in
G Heating Return 1
1
/
4
in 1
1
/ in
H Gas Connection
3
/
4
in
Overhead View
A
B
C
D
4.9” (125 mm)
7.5” (191.3 mm) 10.7” (271 mm)
16.3” (412.6 mm)
25.2" (640 mm)
A
B
C
D
4.8” (122 mm)
7.2” (184 mm) 10.6” (271 mm)
16.5" (420 mm)
25.1“ (640 mm)
<NFB-301C> <NFB-399C>