It doesn't really work that way for many systems. Systems with an ECM motor in the air handler will continue to produce essentially the same CFM as the filter becomes loaded. ECM motors are programmed to provide a specific amount of air flow. Of course, this is up to a point. A filter can become so loaded that the ECM motor cannot compensate. If you have a 4" media filter and no outstanding sources of "stuff" in the air, annual filter changes should be fine.
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Originally Posted by Maker
Please explain.
Comparing two filters that are both MERV 8, similar in construction, and start off the same new condition.
As they both trap dirt, both become plugged. They have less room for air to flow, thus restricting air flow.
If the paper one is becoming more restrictive, that would imply that it is capturing more dust. What else would cause it be more restrictive?
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