Fire monitors with foam eductors make it possible to form a foam spray promptly. Only water is supplied via pipes or hoses to the fire monitor with foam eductor. Dosed supply of foam agent into the water flow is effected from a separate container by the eductor located in the nozzle through a vacuum hose. At the output of the monitor, a foam spray is formed, and in case of shutting off the supply of foam agent, a straight or dispersed water stream is formed.