Navien NFB Series - Dimensions

11About the Boiler
1.5 Dimensions
The following diagrams show the dimensions of the boiler and the table lists the supply connections.
27.6" (702 mm)
Supply Connections
Description Diameter
A Air Intake 2 in
B Exhaust Gas Vent 2 in
C Air Vent Connection
3
/
4
in
D Heating Supply 1
1
/
4
in
E Heating Return 1
1
/
4
in
F Gas Connection
3
/
4
in
G Condensate Outlet
1
/
2
in
Overhead View
A
B
C
3.8” (97 mm)
4.3” (109 mm)
4.1” (105 mm)
9.7” (246 mm)
17.3” (440 mm)
Supply Connections
14.6” (370 mm)
2.6” (67 mm)
12.1” (308 mm)
6.3” (160.5 mm)
D
E F
G
17.3” (440 mm)
9.6” (244 mm)3.2” (81.7 mm)