If sprinklers have been installed, flame spread rating is reduced by how many classifications?

If sprinklers have been installed, flame spread rating is reduced by how many classifications?

• A. One
• B. Two
• C. Three
• D. None

Answer: (A)

Automatic sprinkler systems let you use finishes with a slightly less stringent flame-spread rating because sprinklers slow and control flame spread. Codes permit one class reduction in the required flame-spread rating when sprinklers are installed. In other words, a finish that would normally need the higher rating can be approved one class lower if sprinklers are present. This one-step relaxation helps balance fire safety with practical material choices, while other fire-performance requirements still apply.

Automatic sprinkler systems let you use finishes with a slightly less stringent flame-spread rating because sprinklers slow and control flame spread. Codes permit one class reduction in the required flame-spread rating when sprinklers are installed. In other words, a finish that would normally need the higher rating can be approved one class lower if sprinklers are present. This one-step relaxation helps balance fire safety with practical material choices, while other fire-performance requirements still apply.