The Safe Let 1000 inlet is Ideal for larger airflow requirements, such as Cage Free Layer applications . The Safe Let 1000 is constructed of a PVC frame and a well insulated durable polyurethane rigid foam door. The inlet is designed for minimal thermal loses and avoidance of condensation build up. An integrated airflow intake is engineered into the frame, increasing the volume of air by 15%. There are several accessories available, including weather hood, light trap and bird guards.