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Panasonic introduces a brand new range of Direct Current (DC) Motor Ceiling Mounted Ventilation Fans. With whisper quiet operation & energy efficient performance, these fans provide a quiet and comfortable environment within your home. Modern homes are built with aluminum casing windows and rubber lined doors throughout in order to retain maximum energy efficiency. Most homes and commercial buildings feature sealed windows and doorways in order to limit heating or cooling loss. This generally results in poor Indoor Air Quality (IAQ).