You can see outdated DETACT-T2 (release date 1985) web implementation here. However, DETACT-T2 can still be used, provided that the projected fire growth coefficient is multiplied by the factor 1.67. In addition, when DETACT-T2 is used, the outputs of heat release rate at detector response from the program calculations must be divided by 1.67 in order to establish heat release rates at detector response.

Smoke detector activation time is often predicted by assuming the smoke detector behaves as a heat detector or sprinkler with a low activation temperature (e.g., between 5 ℃ and 20 ℃ above ambient temperature) and a low response time index (e.g., 25 m^½s^½). See Table B.4.7.5.3 Temperature Rise for Detector Response, NFPA 72.

• For RTI of 50 or less, sprinkler is defined as fast response
  • Quick-Response (QR)
  • Early Suppression Fast-Response (ESFR) – is listed for its capability to provide fire suppression of specific high challenge fire hazards
  • Residential – has been specifically investigated for its ability to enhance survivability in the room of fire origin and that is listed for use in the protection of dwelling units
• For RTI greater than 50 and less than 80, sprinkler is defined as special response.
• For RTI of 80 or more, sprinkler is defined as standard response.

Control-Mode Sprinkler Systems – Most facilities use a control-mode sprinkler system. Control-mode systems are rated to “control” a fire until firefighters can come and put out the fire. While in some cases control-mode systems can actually put out fires, they are not rated or engineered to do that reliably.

Suppression (ESFR) Sprinkler Systems – Suppression sprinkler systems are also referred to as Early Suppression, Fast Response (ESFR) sprinkler systems. These systems are designed not to just control a fire but to actually extinguish a fire and lessen the danger to firefighters and occupants. They release a higher volume of water (three to five times more), at a higher PSI, and with a larger pellet size (or droplet size) than control-mode systems. Suppression systems also use sprinkler heads that are larger and more industrial-looking than those found in most office buildings.

Note: The calculator is based on SFPE Handbook of Fire Protection Engineering, Fifth Edition, 2016 — validation test: [1], [2]