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Gas-fired condensing boiler is installed as a direct vent appliance

This direct-vent condensing gas furnace has a fresh air intake.

Wrong – Two combustion appliances are sharing a flue which could lead to backdrafting if one appliance is updated to a direct vent appliance and disconnected from shared chimney.

Wrong - The furnace intake and exhaust are too close to each other and should be facing different directions.

Publication Date

Mon, 03/29/2021 - 12:00

Combustion Furnaces

Guide describing combustion furnaces with selection and installation guidance.

Combustion Appliance Zone (CAZ) Testing

Guide describing how to conduct combustion appliance zone testing.

Gas-Fired Boilers - Code Compliance Brief

The intent of this brief is to provide code-related information about gas-fired boilers to help ensure that the measure will be accepted as being in compliance with the code. Providing notes for code officials on how to plan reviews and conduct field inspections can help builders or remodelers...

Pre-Retrofit Assessment of Existing HVAC Systems

Information guide describing considerations for before retrofitting HVAC systems, retrofit scope considerations, and HVAC system replacement options.

Compact Air Distribution

Guide describing design and installation of compact duct systems for central heating and cooling systems.

Air Seal HVAC Cabinet Seams

Guide describing air-sealing of the seams and holes in HVAC air handler and furnace cabinets.