Every filter is different, they are rated for cfm and filtering
ability. I have a 4" april air that has good flow and filtration, you
have to find a rating in cfm, first pass % efficency and probably
more to know what you are buying. There are 1-2 " junk and 1-2" very
good filters made. How it seals in the case is maybe as or more
important since unfiltered air just bypasses with a bad fit.
Most of the HVAC work me and my brother do is commercial.
Every new installation gets 2" pleated filters because
they simply work better. Homeowners can have large air
filters like Aprilaire Media Air Cleaners installed on
their furnace/air handlers. http://tinyurl.com/yd8tq3
Someone posted that they had a problem with Aprilaire
filter packs sealing so any installation should be
checked thoroughly. There are several different brands
of large air filters and you should pick one that has
media you can obtain from a local supplier.
It is impossible to say from the information provided. The type of
material the design etc all make differences. The most important
factor is to make sure the filter meets the specifications given for
Personally I believe far too much worry is made about filters. You
need to meet the specifications for the furnace to protect it, but you
should not really expect some sort of real change in air quality in
your home because you use this or that air filter. Most of the
advertising related to air filters or all kinds are all fluff. They
don't provide any evidence that the products advertised add anything
to the quality of life in the home where they are used.
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