I have to have an air purifier also even when not sewing because of allergies & migraine headaches. I have one with filter replacement but that can be expensive. I bought a new one last year at Home Depot, paid about $150 because it has a permanent filter that you just take out and rinse. I got a Dyson Animal last year for Christmas, you would not believe the amount of dust it picks up. I would love to add the HEPA to my CA unit but remodeling my kitchen which was in need of an extreme makeover. I still had an avocado green wall oven and paneling in my kitchen.