Navien Gas Water Heater Installation
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Venting:
To fit the unit for non-direct vent, insert the termination end cap (provided with the
Water Heater) into the intake air duct. Do not glue to allow for easy removal and
cleaning of the cap.
Combustion Air Supply Requirement for Non-Direct Vent
:
When a Navien Water Heater is installed without a dedicated intake air pipe (non-
Direct Vent) communicating directly with the outdoors, combustion air must be
supplied to the space. The opening sizes below are Navien’s minimum requirements.
Follow the latest version of the National Fuel Gas Code (ANSI Z223.1 / NFPA 54) or
CAN/CGA B-149.1.
Model
NR, NP-180 (A)
NR, NP -210 (A)
NR, NP -240 (A)
Maximum Input (BTUH)
150,000
180,000
199,000
Outdoor make up air is
provided, a minimum free
area of 1 in2
5.3 in
2
3" (W) x 2" (H)
or 3" round
6.1 in
2
2.5" (W) x 2.5" (H)
or 3" round
7 in
2
2¾" (W) x 2¾" (H)
or 3" round
Indoor make up air is
provided, a minimum free
area of 1 in2
150 in
2
12¼" (W) x 12¼" (H)
180 in
2
13¼" (W) x 13¼" (H)
199 in
2
14¼" (W) x 14¼" (H)
VENTING
