How airtight is your home? Well, this is measured by ACH. ACH (or air changes per hour) measures how often the air inside your home is replaced by outside air. I don’t know about you, but I live in Texas, where I don’t want the outside air being moved into my house. A lower ACH rating means less air leakage, improve your home’s air efficiency and indoor air quality. Our Tytan Professional Gasket Foam creates an airtight seal helping to reduce air changes and improve your home’s ACH rating.