Quote:
Originally Posted by Pinball wizard
The washable filter sold in the villages DOES NOT loose efficiency over time. However, a paper filter that is allowed to accumulate dust (etc.) WILL loose efficiency over time. [/url]
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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?