Nortec GS Series - Manual (Page 15)

GS Series Installation | 12
Direct Vent Guidelines
Follow “sealed combustion guidelines”
All air piping must be listed type for direct vent application with sealed joints and seams, such as z flex.
The air supply line must be installed with air supply terminals provided.
Air hookup may be in plastic provided that it has fully sealed joints per CSA requirements.
Warning:
Horizontal BH type venting must be used in a direct vent application .
Figure 6: Sealed Combustion and Direct Vent Connection
Exhaust Venting
General
The GSTC and GSP are classed category I and III fan assisted gas appliances. This allows two methods of
venting. Listed below are instructions for both venting systems, followed by specific requirements for each
system.
Review the requirements for both category I and III installations and select the venting method best suited
for the installation.
The maximum flue temperature is 400ºF for category I and category III installations. Normal operating range
is 360 to 380ºF.
Category I and III class can be used with sealed combustion option
Category III class must be used with direct vent option.