EASY-TO-INSTALL: Designed for 4'' ducts and use with Exterior Wall Cap (sold separately).
EXHAUST AND SUPPLY AIRFLOW: Features double chambers for exhaust and supply air to help prevent cross contamination.
LONG LIFE, GUARANTEED: Panasonic ventilation fans, switches, modules, and accessories are high-quality and built to last. Included 3-year limited warranty.
PANASONIC ADD-ON: Designed for use with WhisperComfort and Intelli-Balance 100 ERV models and Panasonic FV-WC04VE1 Exterior Wall Cap with 4'' ducts.