Which type of standpipe can be used by both fire department and untrained personnel?

Class III standpipes are designed to accommodate both trained firefighters and untrained personnel, making them highly versatile and practical in various emergency situations. They are equipped with both large-diameter outlets for fire department hoses and smaller, more manageable connections for use by untrained individuals. This design allows firefighters to quickly deploy their equipment while also providing a means for civilians or untrained staff to access water in the event of a fire, facilitating initial response efforts before firefighters arrive.

The inclusion of features that cater to both skilled and unskilled users is what sets Class III standpipes apart. They offer a practical balance between professional firefighting needs and the capability for quick, accessible fire suppression efforts from those who may not have extensive training.