Attic Breeze solar attic fans are best in class, professional grade ventilation products. Other companies may market themselves as offering a professional grade product, but what does that really mean? We believe a professional grade product should be one that is engineered for a lifetime of durability. It should be able to withstand the harshest weather conditions imaginable, intense summer heat year after year, and still function exactly as it was designed. Professional grade means never using plastic (polymer) parts that will degrade in the sun or deform from heat over time. Professional grade is using only the highest quality parts and materials, even if that means it may cost a little more to make the product. And most importantly we believe professional grade means manufacturing in the USA. Attic Breeze, We Are Solar Powered Ventilation.