A required element for fire is one of the three components of the "fire triangle": heat (ignition source), fuel, and oxygen. Any of these three missing means fire cannot start or continue. Therefore, any element other than these three is not a required element for fire. Specifically:
- Heat (an ignition source) is required.
- Fuel (something combustible) is required.
- Oxygen is required.
Anything outside these three is not required for fire itself to exist. For example, fire detection systems, fire alarms, or fire extinguishers are safety measures but not required elements for fire to occur. Hence, the elements that are not required for fire are anything other than heat, fuel, and oxygen.
