Fire extinguishers are further divided into handheld and cart-mounted, also called wheeled extinguishers. Handheld extinguishers weigh from 0.5 to 14 kilograms , and are hence easily portable by hand. Cart-mounted units typically weigh 23+ kilograms . These wheeled models are most commonly found at construction sites, airport runways, heliports, as well as docks and marinas.