Let’s first start with a couple of unbelievable stats about attic ventilation: 90% of current homes have the incorrect attic ventilation. Attics that are improperly vented can reach temperature exceeding 150 degrees and enough moisture can build up to cause large amounts of mold. WOW! In order to correct attic ventilation we need to know what it is. The definition of attic ventilation is: “The process of supplying continuous fresh air through the attic space”. In order to accomplish this, you need to bring fresh air into the attic (intake) and then move the hot moist air out (exhaust).