Duct liners must have a flame spread index of not more than what value?

Duct liners must have a flame spread index of not more than what value?

• A. 15
• B. 20
• C. 25
• D. 30

Answer: (C)

Duct liners are crucial components in HVAC systems, especially for acoustic insulation and to enhance airflow efficiency. When considering safety and fire prevention, it’s essential that materials used in these systems meet specific fire rating standards. The flame spread index is a key measure that indicates how quickly flames can spread over a surface. A flame spread index of 25 or less is generally accepted for materials that are used in ducts, which aligns with fire safety codes. This specification helps to minimize the risk of fire spreading through the ductwork, thus protecting both the building structure and the occupants. In selecting materials for duct liners, ensuring that the flame spread index does not exceed 25 supports compliance with safety regulations while balancing the performance needs of the HVAC system.

Duct liners are crucial components in HVAC systems, especially for acoustic insulation and to enhance airflow efficiency. When considering safety and fire prevention, it’s essential that materials used in these systems meet specific fire rating standards.

The flame spread index is a key measure that indicates how quickly flames can spread over a surface. A flame spread index of 25 or less is generally accepted for materials that are used in ducts, which aligns with fire safety codes. This specification helps to minimize the risk of fire spreading through the ductwork, thus protecting both the building structure and the occupants.

In selecting materials for duct liners, ensuring that the flame spread index does not exceed 25 supports compliance with safety regulations while balancing the performance needs of the HVAC system.