Why the HP Fire Service Turbine S? The High Performance (HP) Fire Service Turbine Stainless Steel (S) meter offers some of the widest flow ranges of any fire service turbine meters on the market. All HP Fire Service Turbines meet or exceed the latest AWWA Standard C703. Maximum continuous flow rates may be exceeded by as much as 25% for intermittent periods. The HP Fire Service Turbine S meter is designed to measure both domestic and fire service usage where flow rates are moderate to high. All HP Fire Service Turbine meters are NSF/ANSI 61 and 372 certified, Underwriters Laboratory (UL) listed, and Factory Mutual (FM) approved for fire service use and include an attached fire service strainer.