I looked and can't find my particular ones listed anymore (or even on Amazon) but they were similar to these and came with HEPA filters-What kind of purifier did you get?
https://www.walmart.com/ip/Holmes-T...QMIDSsPL3EfQRJhl_Dge8bQjU0AM7LDhoCU8MQAvD_BwE
I didn't have time to wait for shipping because we were having a hard time breathing, so had to get what I could find locally. Some for the bedrooms, and one for the living room/kitchen. Within a day of turning them on (and leaving them on) we could breathe better. After a couple of days we only needed to run the bedroom ones at night while sleeping.
Can't say they are the most quiet things, but no different than a typical fan.
The fires lasted for several weeks, and these were a huge help since I have asthma.