BASC Search | Building America Solution Center

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

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

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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.

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

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Combustion Furnaces

Guide

Guide describing combustion furnaces with selection and installation guidance.

Combustion Appliance Zone (CAZ) Testing

Guide

Guide describing how to conduct testing for adequate combustion air in the space where a combustion appliance is located if the appliance is located within the conditioned space of the home.

Pre-Retrofit Assessment of Existing HVAC Systems

Information Guide

Information guide describing options to consider when retrofitting or upgrading a home's HVAC system.

Air Seal HVAC Cabinet Seams

Guide

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