Navien NFB Series User Manual

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)

Navien NFB Series Specifications

General

Type	Condensing Boiler
Fuel Type	Natural Gas or Propane
Heat Exchanger	Stainless Steel
Vent Type	Direct Vent
Vent Diameter	2" or 3"