What are the requirements for an F1 heat hazard designation?

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Teams must fit driver cooling systems, but drivers can choose not to use them under a heat hazard designation
For an F1 heat hazard designation, the governing body can declare it for a race based on the official weather service forecast. When the heat hazard is declared, teams are required to fit a driver cooling system, such as a liquid-cooled vest, and the car’s minimum weight is increased to accommodate the added hardware. Drivers are not obliged to use the cooling system and can instead take a ballast penalty.
What triggers a heat hazard declaration for a race
A heat hazard designation is declared when the official weather service forecast points to high temperatures for the event. In the Austrian Grand Prix case at Spielberg’s Red Bull Ring, the race director cited forecast temperatures in excess of 31°C when the designation was issued.
What teams are required to fit when a heat hazard is declared
Once a heat hazard is declared, teams must fit a driver cooling system, with examples including a liquid-cooled vest. This requirement applies to the cooling hardware installed in the car setup for the race.
What drivers must or must not do with the cooling system
Even after the cooling system is fitted, drivers are not obliged to use it during the race. The rules allow drivers to choose an alternative by taking a ballast penalty instead of using the cooling system.
How the car is adjusted to account for the cooling hardware
With the heat hazard designation, the car’s minimum weight is increased to accommodate the cooling hardware. This ensures the added equipment used for driver cooling is reflected in the car’s weight limits for that race.

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What are the requirements for an F1 heat hazard designation?

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