You are calculating friction losses through a hot water heating system`s piping, include equivalent losses for fittings valves or other devices must be included to determine if the circulating pump is properly sized for the sy stem. According to The HVAC Testing, Adjusting, and Balancing manual, this friction loss is generally calculated at how many equivalent feet?

You are calculating friction losses through a hot water heating system`s piping, include equivalent losses for fittings valves or other devices must be included to determine if the circulating pump is properly sized for the sy stem. According to The HVAC Testing, Adjusting, and Balancing manual, this friction loss is generally calculated at how many equivalent feet?