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Guide describing categories of direct-vent combustion space- and water-heating equipment and combustion safety testing.

Guide describing how to provide combustion air for fireplaces and how to test fireplaces for combustion safety.

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.

Guide describing combustion furnaces with selection and installation guidance.

Guide describing oil-fired boilers and hot water heat distribution systems used for home heating.

Guide describing gas-fired boilers and hot water heat distribution systems used for home heating.

Guide describing condensing boilers and hot water heat distribution systems used for home heating.