I wouldn't recommend this company to my worst enemy. They told me that the best thing for my house was ridge cap. After installing it I found that my whole house fan didn't even creatre a breeze in my home. After contacting a manufacturing rep. who told me his product was not designed for my type of house (Gable) I called the owner of Expert who finally admitted his mistake, and said he would fix the problem. Long story short he never did. He was rude and tried to turn the tables on me. Please, for your own good, check other companies. I definately would not want someone else to go through whart I had to.