A 4.6 is pretty good, I put 5! I recently installed a new central air conditioner, I even forgot to put a new filter in it. Like 3 dogs at home and someone with horrible sinuses (2 surgeries to open them) I'm doing my best to breathe easy. An air ionizer, an air purifier from Honeywell, and I was wondering why my sinuses started acting up at night. old filter! Came straight home today, replaced the old one (covered in layers or dust and hair and stuff) and put the new one in. After a good 5-6 hours, the house will smell better and the air will just be easier to breathe. I have found my new place! The air is just fresh and clean. Great price, great filter.
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