I get my filters from WW Grainger when they are on sale. I go with the 1
inch pleated ASHRME (sp?) high rated. About 4 bucks each when ya buy a dozen
for my size. They say they will last 60-90 days I change them when they are
30 days old
No. Thickness does not equal air resistance.
Many "thick" air cleaners have less resistance than thin ones. They
often have much higher surface area and may filter better, longer and have
less resistance. It all depends on design.
I might add that the difference in the cost of electricty is likely to
be very small.
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