Depending on your building and its application, you might require standard response or quick response sprinklers. Which is best for you?
Quick Response vs. Standard Response Sprinkler Heads - Vanguard
Quick Response Sprinkler Heads: A Quick Guide
Standard vs. Quick Response Sprinkler Heads
VK3501 - Quick Response Upright Sprinkler (K8.0)
VK351 - Microfast® Quick Response Fusible Element Upright
FIRE SPRINKLER HEAD (HK / GLOBE BRAND) UL FM APPROVED - 1/2
Difference Between Standard, Residential & Quick Response Sprinklers
Quick Response vs Standard Response Sprinklers
Quick Response - Viking NZ