I have a few portable air purification systems in my home and they both take hepa air filters.
When the hepa air filters were used up I went to buy new ones and I was quite shocked at high priced that they were! They cost almost half the cost of the actual portable air purification systems.
If I had known this when I bought the air purifiers I probably would have went with another brand that did not have hepa air filters. With these 2 portable air purification systems that i have no other air filter but the hepa brand air filters will actually fit with them. They are custom for this particular portable air purification system. What a way to make continuous money! I bet hepa has some kind of deal with the maker of the portable air purification system. I decided that I have no choice but to have to go and buy these very high priced hepa air filters for the portable air purification systems. I think I am going to look into buying a different brand of portable air purification system that will allow me to buy cheaper air filters when they run out. This business with the hepa air filters being the only air filters that will work inside it actually to me sounds like a money making scheme. Like I said, I wish I would have known this before hand and I would have went a different direction. If I keep buying these overpriced hepa air filters for the portable air purification systems, in time I could probably just invest in a whole home air purification system!