I hate how expensive AC filters are but damn it was worth it because I can finally breathe a lot better at night. I have severe allergies and swelling in my nasal passage so, on top of the frequent changes and an American bulldog shedding hair like crazy, I could hardly sleep from being stuffed. Finally, this filter helped a lot! If you suffer from allergies, you will not regret buying this filter! 3M 2200 complete! I have a 3 room apartment.
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