This is because HEPA filters are so dense and not designed for all styles of HVAC systems, especially the older models
Back in the day, I never imagined that I would ever require a HEPA filter for my HVAC system. I regularly just got average air filters, not the cheapest kind but nothing fancy either. That was until one day when a good friend of mine bought me a UV air purifier. This UV air purifier was truly top of the line and it even measured the air quality in your home so that you know when to change the HEPA filter. Now using the HEPA filter I thought would be enough, but the UV light works to eliminate harmful contagions and contaminants. I’m talking about getting rid of viruses, bacteria, and even mold spores! That’s what my UV air purifier does for me and I’ve come to learn how much better HEPA filters work compared to all other types of air filters! After using this UV air purifier for so long and enjoying improved air quality, I decided that I really should invest in HEPA filters to use with my HVAC system. When I was talking about doing this though, my buddy warned me that I had to make sure my HVAC system was capable of using HEPA filters. This is because HEPA filters are so dense and not designed for all styles of HVAC systems, especially the older models. So I checked with the HVAC company and sure enough, I can get HEPA filters for my system. I ordered a few HEPA filters to start and now I always get complimented on my excellent air quality in my home these days.