the only thing I do not like, so far, it that when you are trying to take the grates out, they fall out when just barely touched. The other thing I do not like is unique to our household. We have swarming termites that are flying down the vent and getting into the house through the vent a hood. Not sure what we can do to stop this, and it is in not way a reflection on this product. I LOVE the product.