Does anyone use a HEPA air purifier for pet dander allergies? If so please let me know if it really helps.?

I live in a basement apt. and I have 3 cats. My nephew lives upstairs and he has bad cat dander allergies. We have an air purifier on the furnace but it does not really help. I am now thinking of getting one for his personal use in his bedroom. Does anyone know if this will help? I don’t want to have to get rid of my cats, which is what they are asking me to do.Help.


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