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Venting:
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To fit the unit for non-direct vent, insert the termination end cap (provided with the
water heater) into the air intake collar. Do not glue to allow for easy removal and
cleaning of the cap
Combustion Air Supply Requirement for Non-Direct Vent:
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When a Navien water heater is installed without a dedicated air intake 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 2223. 1 / NFPA 54) or
CAN/CGA B-1 49. 1 .
Model
Maximum Input (BTUH)
Outdoor make up air is
provided, a minimum free
area of 1 in2
Indoor make up air is
provided, a minimum free
area of 1 in2
CR, CC-180 (A)
CR, CC-21 O (A)
150,000
2
5.3 in
3" (W)
2" (H)
2.5" (W)
X
or 3" round
2
150 in
12%'' (W}
12%'' (H)
13W' (W)
X
CR, CC-240 (A)
175,000
199,000
2
6. 1 in
7 in
2.5" (H)
2%" (W)
X
or 3" round
or 3" round
2
175 in
199 in
14 %'' (W)
13W' (H)
X
2
2%" (H)
X
2
14 %'' (H)
X
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