Have been using the 3M (Red) Micro Allergen filter with the 1000 rating
for many, many years.
Have develped Asthma, and would like to step up to a "better" one with
the superior filter properties.
Furnace (hot air type) is fairly old, and can't find specs on it.
Do you think I have anything to worry about regarding the larger
pressure drop these "better" ones have, and its impact on the
blower fan performance, life, or safey ?
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