![For fans with butterfly shutters, installing discharge cone covers or socks has proven to reduce air leakage.](https://img.wattagnet.com/files/base/wattglobalmedia/all/image/2023/12/butterfly_shutters.656f809f4f4a4.png?auto=format%2Ccompress&q=70&w=400)
For fans with butterfly shutters, installing discharge cone covers or socks has proven to reduce air leakage.
Mike Czarick
You conducted a static pressure test on one of your houses. You don't reach the recommended level of tightness, or maybe due to high heating costs, you suspect a house is not as tight as it should be. What's the next step?