A gravity relief hood is a type of ventilation system that is used to help reduce the amount of air pressure in a building or room. It works by allowing air to escape from the top of the hood, creating a vacuum effect that pulls air out of the building or room. This helps to reduce the amount of air pressure that builds up inside the building or room, allowing for better air circulation and a more comfortable environment. Gravity relief hoods are commonly used in industrial settings, as well as in residential homes. They are especially beneficial in areas where there is a high amount of air pressure, such as in high-rise buildings or in areas with a lot of wind. Gravity relief hoods are designed to be easy to install and maintain, and they are an effective way to reduce air pressure and improve air circulation.