Installation As A Category I Appliance
General
1. The Nortec GS Series humidifiers have a fan-assisted
combustion which operates with a non-positive vent static
pressure when installed with the appropriate vent diameter.
2. Category I appliances must be vented vertically or nearly
vertical.
3. This category appliance is restricted to vertical venting
installations with limits placed on horizontal lengths and vent
diameters. Refer to the tables in local and/or national codes.
No sidewall termination is accepted.
4. Vent piping must be UL or UL/CSA listed Type B. Required
clearance for Type B vent is piping is 1” (25 mm).
5. A minimum equivalent vent length of 7 feet must be
connected to the humidifier. Vent lengths must not exceed
70’ (21 m). Each 90° elbow is equivalent to 10’ and each 45°
elbow equals 5’. The vent run should be as direct as possible
with no more than 6 elbows in the system. Contact Condair
Technical Services if you have any questions.
6. The vent pipe exiting the humidifier is sized for category III
installations. A field supplied adapter is required to increase
the pipe immediately at the exit of the humidifier. The vent
pipe must be expanded to the minimum sizes listed below for
each model, increasing as code requires.
a. Nortec GS 100 4” minimum diameter
b. Nortec GS 200 5”
c. Nortec GS 300/400 7”
d. Nortec GS 500/600 8”
7. The termination at the humidifier is a male connection.
Standard venting hook-ups require a female path. It is highly
recommended that a female to female adapter be assembled
onto the humidifier to establish the proper venting sequence.
Consult with the venting manufacturer for proper hook up.
8. Vent connectors shall not be connected into any portion of a
mechanical draft system operating under positive pressure.
9. Use only double wall (aluminum inner wall) b vent. Single
wall venting cannot be used due to the increased wet time in
the lining. If the vent connector attaches to a lined masonry
chimney, the chimney must be sized and installed according
to the provisions of the national fuel gas code or Canadian
CSA B149.1 standards. An approved venting manufacturer’s
termination cap for the stack outlet must be used.
10. When the category I installation is selected it may be
commonly vented with other listed gas fired appliances.
Total input rates of all appliances will determine the vent
size; the chimney must be sized and installed according to
the provisions of the national fuel gas code or Canadian CSA
B149.1 standards.
11. A maximum of 4 gas appliances may be common vented
on the same floor. Multiple story common venting is not
recommended.
12. Refer to the vent manufacturer’s instructions for proper
clearances to combustibles.
