SME type medium expansion foam nozzles are used to fight flammable liquid risks where foam should be applied on from an overhead firefighting network. SME type medium expansion foam nozzles were designed to work on the Venturi principle. A stream of foam solution is sprayed at high speed to an expansion net, drawing into the body the air required and producing foam with an expansion ratio of about 1:20. Their high reliability makes them very dependable in critical situations such as truck loading areas in the Oil & Gas industry. They are made of stainless steel with a spray nozzle made out of brass. Flow rates are factory calibrated according to request. The connection to the fire protection network is threaded DN 20-¾" or DN 25-1" depending on flow rate.