Nortec GS Series - Manual (Page 21)

GS Series Installation | 18
Figure 13: Exhaust Connection
Installation As A Category III Appliance
General
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.
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.
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 nortec 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. All joints must be sealed using high temperature rtv silicone.
The gas humidifier is supplied with the following exhaust outlets.
GS 100 3”
GS 200 4”
GS 300/400 5”
GS 500/600 6”
The venting must remain the same diameter throughout the installation. Horizontal BH type venting must be
used in a direct vent application.
Warning:
Provide a screen or barrier to prevent personal injury in areas where inadvertent personnel contact with
vent pipe can occur.