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Guide describing a method for insulating an unvented attic by spraying foam insulation along the underside of the roof deck.

Guide describing how to add spray foam insulation to the underside of the existing roof deck as part of the conversion of a vented attic to an unvented, insulated attic.

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

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

Guide describing combustion furnaces with selection and installation guidance.

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