Running your furnace, central air, or heat pump probably constitutes a big part of your utility bill. But it’s a small, often inexpensive part—the air filter—that keeps these heating and cooling ...

Anyone who has attempted to measure the pressure drop of a filter mounted in a filter grille will admit it’s a challenge. Some installations have a significant amount of return duct between the filter ...

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Measure and calculate the proper size and then verify the design It’s often taught that diagnosing a restrictive air filter is as simple as a visual inspection to see if it’s plugged. And, if the ...