TIPS FOR USING THIS GUIDE:Always specify counterflow operation for maximum performance.The heat exchanger can be mounted vertically if required, however, this may require special mounting brackets.If the sizing procedure suggests a nonstandard length heat exchanger, use the next larger size or consider using two shorter heat exchangers.Never rely on the copper ports to support the heat exchanger.Consider using two or more heat exchangers when:a) the Heat Transfer Load, Q, is greater than 400 MBtu/h,b) space for locating the heat exchanger is limited, orc) temperature and flow parameters are outside the recommended range for a single heat exchanger.