Manometers or pressure gauges have been used to measure air pressures for more than 200 years. The fathers of our industry used these gauges to learn about the mysteries of fans and duct systems. We use these same instruments (Although a little updated) to reveal similar mysteries about the systems we install and service today. Measuring pressure is just as critical in our time. Without testing and using the right tools, many technicians make incorrect assumptions about air capacities ...

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