February 1, 2015 Jeff Rosenblum
Whether performing an installation in a new construction home or a system change-out on a 50 year old home, knowing the static pressure on your duct system may give early detection of problems that may not present themselves for several years.
Measuring static pressure gives a solid indication of the volume of air being moved throughout the system. Most residential systems are designed to operate within .5 inches of water column.
To measure the static pressure in your duct, you must have either a digital or magnahelic manometer.
If the numbers show anything higher than the manufacturers recommended ratings, check the sizing of the ductwork (both return and supply), and the filter to verify that the system can handle the rated pressure drop.
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