The Star-Kap is the only vent cap that is not required to be 2 ft higher than any structure within 10 ft when used on detached or lean to buildings that house heating equipment outside of the living space. The unique design of the aluminized Star-Kap vent cap prevents downdrafts and assists the vent in drawing off and exhausting waste gases regardless of wind direction. The Star-Kap can be used to vent gas or oil-fired boilers, furnaces, water heaters and more. Although vent stacks are designed to remove dangerous gases and smoke created by burning gas and oil, this process can be adversely affected by the direction of the wind. A sudden gust could blow noxious waste gases down the vent stack and into the building. The Star-Kap prevents a potentially dangerous situation.