I deal with some pretty bad air due to my neighbor (duplex) I added the heavy smoke filter. I am so happy to have validation when it kicks on turbo red, after turbo purple (heavy smoke) all evening, every evening. Also, I don't have a stove fan for cooking odors and this does the job, hands down.
I just ordered a T500 for my upstairs tiny bedroom that is like an oven in the summer and has no cross ventilation. I look forward to better night breathing!
Thank You Alen Co for the great, ethical company you are.