ICC Commercial Mechanical Practice Exam

Fiberglass or foam insulation is widely used for ductwork due to its excellent thermal performance, corrosion resistance, and adaptability in various environments. Ductwork often carries conditioned air, so maintaining appropriate temperatures is crucial to energy efficiency. Fiberglass insulation, with its ability to handle temperature variations and resist moisture absorption, makes it ideal for this application. It provides effective thermal insulation and sound attenuation, which can minimize the noise produced by air movement through the ducts.

Foam insulation is also utilized because of its superior sealing properties, which help prevent air leaks and improve overall efficiency within the HVAC system. These materials not only enhance energy conservation but also contribute to maintaining indoor air quality by reducing the possibility of condensation and mold growth within the ducts.

Other options may have specific applications, but they are not as commonly used for ductwork insulation. For example, mineral wool is more suitable for fireproofing and sound insulation in different contexts, while cellulose is often employed in wall cavities and attics. Polystyrene can be effective for certain insulation needs but typically lacks the practicality of fiberglass and foam within ductwork applications.