From thread Any thoughts on the Boair 5 stage filter
Its an electrostaticair filter, They just charge more for it tehn other companies.
To the poster that has one.
When your filter is dry. After your A/C has been running for about 15 minutes, see what the air temp is out of your closes register to the unit with the MERV 6 in(presuming its a relatively new filter, and in near new condition), then put your electrostatic in and leave it run 5 more minutes and see what the temp is. If its lower, the filter is slowing your air flow, and decreasing the units efficiency.
Duct systems not designed for a restrictive air filter, shouldn't have electrostatic filters installed in them. Can cause air flow to drop to much and cause poor cooling performace, or compressor damage.