Product review (5 stars): Nutone Range Hood Filter
I do not conduct a whole lot of cooking in my kitchen, but I had determined I have collected so much grease within the last two years that I was due for a new one.  Recommendations suggest this product be replaced every six months but for me I doubt if I will need to replace it within another year or two.  The only problem with this product is that it is very difficult to find this type of model in Lowe's or Home Depot, or even Ace Hardware for that matter.  Generally, those stores would have to order it and, unfortunately for them, the best route in terms of cost is through Amazon.com (at least it was for me).  With that all said and done, I am very pleased with my order through Amazon.com.