The ECOAIRF00040 5" Core Vent is a non-controllable wall vent designed to provide permanent airflow for combustion appliances. Finished in brown for a traditional and discreet appearance, it is suitable for both residential and light commercial installations where fixed ventilation is required. Designed for durability and reliable airflow performance, this vent is ideal for boilers, gas fires and other combustion appliances requiring passive ventilation in accordance with current building regulations. Suitable for internal and external wall applications.