Pipe insulation installed in buildings must conform to which ASTM standard for flame and smoke indices?

The correct answer is ASTM-E84, which is the standard test method for surface burning characteristics of building materials. This standard is crucial for assessing the flame spread and smoke development indices of materials used in construction, particularly with regard to fire safety.

In the HVAC context, pipe insulation is subjected to ASTM-E84 to ensure that it will not contribute excessively to fire spread or generate harmful smoke in the event of a fire. The results from this standard help architects, engineers, and building inspectors determine whether the insulation meets safety codes and regulations for buildings.

This standard is particularly important in ensuring that materials used in residential and light commercial buildings do not pose a fire hazard. Insulation materials that pass the ASTM-E84 test typically have lower flame spread and smoke development ratings, making them safer choices for use in occupied buildings where occupants must have time to escape in case of emergencies.

The other options do not pertain to the flame and smoke indices in the same context as ASTM-E84. For example, ASTM-D123 relates to the testing methods for physical properties of materials, ASTM-C567 covers the test methods for insulated concrete forms, and ASTM-F123 does not address fire safety directly. Thus, ASTM-E84 remains the relevant standard for ensuring safety concerning flame and