The WhisperVent Wall Cap is designed for use with WhisperComfort 60, as well as the Intelli-Balance 100 ERV’s. This optional accessory simplifies installation with both exhaust and supply airflow through a single 7.5" penetration in the building envelope. The dividers of the unique Y shaped chamber and the wall cap help prevent cross contamination; with air flow rated up to 100 CFM per side. Unlike traditional installations where two wall caps were required, the WhisperVent Wall Cap accessory with Expanded Polystyrene adapter conveniently allows both exhaust (from the one side) and supply (from the second side), through a single 7.5" penetration in the building envelope.