ransley wrote:
The real gimmic are the fiberglass filters that let 95% of dirt
through and degrade system performance by clogging up coils. My
neighbor had to remove his AC coil one winter, he got no heat it was
clogged shut, next spring he power washed it. A properly designed
system and ductwork can handle a 3M filtrete filter, if it cant its an
airflow problem possibly from poor ductwork design. For a Hepa filter
on a standard homes AC the filter might need to be the size the air
handler to give it proper airflow , the filters would cost 100$ to
replace. I use a 4" pleated merv 10 Honeywell replacement filter that
doesnt reduce airflow and doesnt even have to be changed every year
since the surface filtering area is very large, maybe 30-40 sq ft. My
4" media is recommended by my Space Pack manufacturer.

Where do you buy those filters? I have an ideal spot to install one, and have
been thinking about just that.