Vents bases are the components of a ventilation system that provide a stable and secure foundation for stationary or rotary vents to be installed on. These bases are typically made from a durable material such as galvanized steel, aluminum, or plastic and are designed to withstand the elements and protect the roof or building structure from damage.

The type of stationary and rotary vent base required depends on the specific type of vent being installed. For example, ridge vents require a ridge cap or end cap to be installed at the top of the roof to provide a secure base, while soffit vents require an appropriate soffit material to be installed to create the base.