(A) Product description ?? The device used for fighting fires and class B A, Class B fire mix; can be used independently as the fire protection equipment, and can be used with large fixed foam fire fighting systems play a supporting role, mainly for oil, oil Tank and refineries, petroleum, chemical industry, oil ports, hangars, garages, warehouses, gas stations and other places. Has good mobility, flexibility, can grab and foam, foam generators and other components of low, medium and high expansion foam fire extinguishing systems. (B) the working principle of the apparatus body 316 or 304 stainless steel plate is made, using PHF-type negative pressure proportioner, it is the use of the venturi principle reason a negative pressure at the outlet, by pipette from the foam liquid tank proportioner inhalation, mixed with water to become foam mixture, put out the fire through the air to form an air bubble bubble gun.