Product review (3 stars): It was missing an instruction manual. After using it out vent was torn inside out wall? (Maybe user error)
It works decently well. Our package was missing an instruction manual, but upon going onto Gardus' website we were easily able to print one out.

You have to be careful/cautious with this product. When we used it, it ended up tearing a hole in our vent INSIDE our walls. I don't know if that's really an error so much on the product of really on my husband who may have been heavy handed. Since the box was missing an instruction booklet and this product MAYBE tore out vent (but also maybe not) I'm giving it a "MAYBE" rating.