Installation As A Category III Appliance
General
1. This venting system can be installed horizontally or
vertically and can terminate on a rooftop or sidewall
provided the NFGC (Nation Fuel Gas Code) and CAN/
CGA- B149 codes are followed. The venting manufacturer
instructions must also be followed.
2. Venting must be UL or UL/CSA listed, tested to ULC-5636
standard. Venting may be BH, L vent or Special Gas Vent.
The vent shall be listed and installed in accordance with
the terms of the vent listing and the manufacturer’s
instructions. The instructions listed below should be
followed as well.
3. 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 service if you have any
questions This category installation may not be common
vented with any other natural draft gas appliance or
power assist appliance.
4. All joints must be sealed using high temperature rtv
silicone.
5. The gas humidifier is supplied with the following exhaust
outlets.
a. Nortec GS 100 3”
b. Nortec GS 200 4”
c. Nortec GS 300/400 5”
d. Nortec GS 500/600 6”
6. The venting must remain the same diameter throughout
the installation.
Additional requirements when venting through
a sidewall
1. For sidewall venting, locate the humidifier as close as
possible to the wall being used.
2. Locate the vent terminal at least three feet above any
forced air inlet located within ten feet; or at least four feet
below, four feet horizontally from, or one foot above any
door, window, or gravity air inlet into any building.
3. A minimum horizontal clearance of four feet from electric
meters, gas meters, regulator and relief equipment is
required.
4. For sidewall vent terminations, the humidifier must be
installed with the certified vent terminal that can be
purchased from Condair.
a. Nortec GS 100 3” P/N 1502321
b. Nortec GS 200 4” P/N 1502322
c. Nortec GS 300/400 5” P/N 1507320
d. Nortec GS 500/600 6” P/N 1507321
5. Locate the vent terminal at least 7 feet or 2.1 m above
grade from public walkways, adjacent buildings, operable
windows and building openings, consistent with the
National Fuel Gas Code ANSI Z223.1 and/or CSA B149.1
installation codes.
6. Locate the bottom of the vent terminal at least twelve
inches above grade or ground, or normally expected snow
accumulation level. The snow level may be higher on walls
exposed to prevailing winds.
7. Locate terminal at least 4 feet or 1.22 m from electric
meter, gas meters, regulators, and relief equipment.
8. Avoid areas where local experience indicates that
condensate drip may cause problems such as above
planters, patios, or over public walkways, or over an area
where condensate or vapor could create a nuisance
or hazard, or could be detrimental to the operation of
regulators, relief valves, or other equipment. Refer to the
vent manufacturer’s installation instructions.
9. The vent terminal must be installed in the same
atmospheric pressure zone as the combustion air inlet of
the humidifier. If this is not possible (as in cases of positive
or negative room pressures) the humidifier should be
installed with the sealed combustion or direct vent option.
