Nate Core Practice Test 2025 – Comprehensive Exam Prep

Fiberglass or foam insulation is preferred for minimizing energy loss in ductwork because it provides an effective barrier against heat transfer. These materials are specifically designed to resist the flow of heat, keeping conditioned air at the desired temperature as it travels through the ducts. Fiberglass insulation has an excellent thermal resistance (R-value), which measures its effectiveness at reducing heat transfer. Foam insulation also offers exceptional insulative properties, often taking the form of spray foam or rigid panels that tightly conform to the duct surfaces, enhancing the seal against air leaks.

The other materials mentioned do not provide the same level of thermal protection. Wood shavings lack the density and consistent protective qualities necessary to effectively insulate ductwork. Bubble wrap, while potentially useful in providing some minor insulation, does not have sufficient thermal resistance for duct applications. Metal sheeting, on the other hand, is a good conductor of heat and would not prevent energy loss but rather allow it, making it an unsuitable choice for insulation in ductwork.