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Guide describing how to insulate a vented attic in an existing home using blown insulation added to the attic floor.

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

Guide describing how to air-seal bathroom and kitchen exhaust fans.

Guide describing how to install a bathroom exhaust fan to remove excess moisture.

Guide describing how to install an exhaust fan in an attached garage to pull fumes out of the garage and to depressurize the garage with reference to the home.

Guide describing the retrofit of kitchen exhaust systems, including duct sizing and routing considerations.

Guide describing how to select and install whole-house ventilation systems for existing homes.

This guide describes how to install a whole-building ventilation system to provide adequate dilution of indoor air contaminants.