This is my setup...
I was using a filtrete filter and recently stopped buying them because of their restictive nature. I have also recently installed a bypass HEPA filter on my system. I now use the cheap blue filters at my return duct. I was told that is OK but I really am having a hard time with this decision. The HEPA only goes through 10% of the air from the return and the blue filters are the only thing between the components and the dirt.
I've been changing the the previous Filtrete filters religiously for 5 years and will do the same with the new filters. I'd hate to get my components dirty at this point. thanks.
My ESP was tested and is within reason. I would like to step up to a Merv 4 or 6? if possible. As long as it's better than the blue ones. Can anyone make a recommendation for a brand with the lowest restriction?