Which halon is most commonly used in fixed fire suppression systems?

Halon 1301 is the most commonly used halon in fixed fire suppression systems due to its effectiveness and characteristics. It is a colorless, odorless gas that, when discharged, creates a rapid suppression of fires, particularly in enclosed spaces where conventional water-based suppression systems might not be ideal. The unique properties of Halon 1301 allow it to interrupt the chemical reaction of combustion, making it highly effective against a wide range of fire types, including Class A (ordinary combustibles) and Class B (flammable liquids) fires.

One of the critical factors that contribute to its preference in fixed systems is its ability to be discharged in a manner that minimizes damage to sensitive equipment, making it a popular choice in environments like data centers, telecom facilities, and aircraft. Additionally, Halon 1301's effectiveness at low concentrations allows for its use in areas where the presence of people must also be considered, as it reduces the risk of harmful exposure.

Other halons, such as 1211, 2401, and 1401, serve different purposes and applications but do not match the widespread use and effectiveness of Halon 1301 in fixed suppression systems.