Navien CH-180 Installation Manual - Venting:
Venting:
Combustion Air Supply Requirement for Non-Direct Vent:
Have to enough make up air for all other gas appliances that may be located in the vicinity as well.
Maximum Input (BTU)
199,000
7 in
2
2¾" (W) x 2¾" (H)
or 3" round
199 in
2
14¼" (W) x 14¼" (H)
Outdoor make up air is provided,
a minimum free area of 1 in
2
Indoor make up air is provided,
a minimum free area of 1 in
2
Model
CH-240
175,000
6.1 in
2
2.5" (W) x 2.5" (H)
or 3" round
175 in
2
13¼" (W) x 13¼" (H)
CH-210
150,000
5.3 in
2
3" (W) x 2" (H)
or 3" round
150 in
2
12¼" (W) x 12¼" (H)
CH-180
When a Navien Combination Water Heater / Heating Boiler 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.
To fit the unit for non-direct venting, insert the termination end cap (provided with the
Water Heater / Heating Boiler) into the intake air duct. Do not glue to allow for easy
removal and cleaning of the cap.
36
VENTING