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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 – 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.

Combustion Furnaces

Guide describing combustion furnaces with selection and installation guidance.

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.