The Fellowes AeraMax DX5 air purifier has been a fantastic addition to my home. It helps to reduce allergens, pet dander, dust particles, germs, candle smoke etc from the air to make for a healthier living space. This needs two types of filters, one is an air filter the other is a carbon filter. The filter replacements are $29 to $39. I have only seen them available at Canadian Tire.