Location of air intake and flue gas terminal must comply with all local and national regulations.
EXHAUST VENTING
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.
Category III class must be used in direct vent applications.
GENERAL REQUIREMENTS
The vent systems shall be listed to UL or UL/CSA standard and meet the installation requirements of the National Fuel code in the USA ( ANSI Z223.1) and the Canadian Standards CAN/CGA.B149 Installation Codes. Any local jurisdictions reflecting changes to the above codes should be observed.
In applying the codes, reference should be given to the venting manufactures instructions, the serving gas supplier regulations, and the specific instructions provided in this manual.
This appliance must be installed to comply with national regulations and codes. A qualified technician, competent with these codes and the local requirements of the jurisdiction must carry out the installation.
Proper removal of combustion gases must be assured, and building materials must be protected from degradation by flue gases.
Never mix venting types. (B to BH or visa versa.) Never use two different manufacturer’s equipment for the same chimney.
All vent runs should be as direct as possible with no more than 6 elbows in the system.
Maintain an upward slope of ¼” per ft on all horizontal vent pipe runs.
This gas humidifier may not be used in conjunction with a power venter or draft inducer.
Figure #6
Horizontal Venting Using a Direct Vent Application Using BH Type Only
Wall 
BH type vent using double wall vent |
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with all joints being air and water tight. |
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Reference local and/or national codes |
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before installation of the vent |
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| Condensate |
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Condensate tee and trap must | Tee | 2 ft Min | ||||||
Trap |
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| 3” Min |
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be installed. Take the condensate |
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to a floor drain or a condensate pump |
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Exhaust venting outlet
Exhaust venting must be min.4 ft, max.6 ft in distance apart from the fresh air intake for direct venting
Terminations supplied with unit
Steam
Direct vent Inlet
Outlet 
BH type double wall with double wall connectors required.
Note: These are guidelines only. Follow the local and/or national codes in your respective area.
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