Need help ASAP!! Based on your reading of the following selection, why would a fire apparatus be required to carry a minimum of four SCBA?
Firefighters want to be prepared for any eventuality. Therefore, each fire apparatus will carry one emergency SCBA for each seating position on the apparatus, with a minimum of four on each vehicle. A space SCBA cylinder with a minimum of thirty minutes of breathable air for each SCBA will be included as well.

The average firefighting call lasts over an hour so everyone will need to switch out their SCBA

Both the fire truck and the fire engine carry a minimum of four people.

Thirty minutes of breathable air doesn’t last as long in extreme heat conditions

Extras are needed to account for the structural defects of the cylinders.