MERV 13: A MERV 13 air filter however will capture even smaller dust particles, dirt, pollen, mold spores, pet dander and more from your home's air. A MERV 13 air filter is great for people with regular allergies and who own multiple pets. The MERV 13 filter is typically more expensive and will also put more strain on your HVAC system, however the high quality filtration you will get will be well worth it. 
Just an observation, as I've tried to educate myself about home filtration systems, I have found a surprising number of sites that try to appear unbiased, but with a little reading can be seen to be favoring filters over all other system types. It may be that filters are better for certain applications. But the fact that they're being sold as 'all-things-to-all-people' makes me suspicious. The fact that at least a couple of sites (usually .org sites) appear to be hiding their identity also makes me suspicious. It also makes me wonder what so good about the non-filter systems that has the filter folks so worried.
HEPA air filters have an efficiency rating of 17 to 20. However, most residential HVAC systems can't accommodate HEPA filters because they are too large or restrict airflow. Switching to HEPA filters will significantly improve your indoor air quality, but doing so will probably require calling a heating and cooling professional to retrofit your furnace.
We offer only the finest water filters, many of which are ANSI/NSF Tested and Certified. Also we offer reverse osmosis systems, whole house water filters, HEPA air purifiers, refrigerator water filters and air conditioning/furnace filters...all personally tested and approved by our knowledgeable staff. We've narrowed our selections to include only the top-rated brands in the marketplace. We do our due diligence. so you don't have to...after all our name is BestFilters. Questions about water filtration or air purification send an email to [email protected]. 
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