Ventilation Overview: Exhaust, Supply, and Balanced
A building ultimately becomes a personal space. The very best building creates an ideal environment for its people - a home. Ventilation plays a key role in determining this outcome. Think of your building's envelope as the foundation for a successful ventilation strategy. A tight enclosure that minimizes moisture and air leakage lays the groundwork for a good ventilation system also provides better energy performance overall. This creates a healthy, durable, energy-conscious space. However, a tighter envelope also means that providing fresh air exchange becomes even more important. Codes and standards, building materials, climate zone, aesthetics, and occupant behavior all place demands on ventilation. Competing with these demands are your goals of achieving indoor air quality, energy performance, and durability Learn More.
Mechanical ventilation draws out pollutants and draws in make-up air in a controlled manner. Controlled ventilation strategies divide into 3 main categories: exhaust, supply, and balanced systems. Exhaust ventilation removes pollutants at the source An inexpensive and simple approach to ventilating a home, exhaust-only ventilation works by forcing air out of the home to depressurize the interior and gain make-up air through passive vents. Because this ventilation system only actively exhausts air, it is not recommended in hot or humid climates. Since any make-up air is gained passively, that air may be very humid, contain pollutants, or be too cold, leading to energy penalties for the home. Powerful exhaust systems, such as commercial-capacity range hoods, should be used cautiously with combustion appliances, as they can cause back drafting. Supply ventilation dilutes pollutants Supply ventilation, another simple and inexpensive approach, uses a fan to pressurize a home, actively bringing outdoor air inside while squeezing out indoor air. Supply systems offer better control over pollutants in incoming air, as they only obtain outdoor air through specified vents.
Pressurizing the house more readily forces out combustion gases and other pollutants. However, supply systems struggle with conditioning or removing moisture from incoming air, and can raise heating or cooling costs. Balanced ventilation is best Balanced ventilation works by both actively exhausting polluted indoor air and actively drawing in fresh, outdoor air in a balanced, controlled ratio. Because the system uses more fans and ducts than either the supply or exhaust approaches, it is more costly. However, balanced ventilation is appropriate for all climate zones. By coupling a balanced approach with an energy recovery or heat recovery ventilator (ERV or HRV), incoming air can be conditioned and dehumidified, saving on heating and cooling expenses for the home. A tight enclosure guards the interior of the home and guarantees that air is properly enclosed and controlled.
Mechanical ventilation can take the benefits of a healthy home one step further by providing a controlled source of treated fresh air that balances indoor air quality with energy savings. Panasonic Solution Center: WhisperGreen Select is a customizable all-in-one fan or fan/light combination that gives you more than  possible configurations: variable flow rates and plug 'n play modules featuring Multi-Speed Operation, Motion Sensor, Condensation Sensor and Automatic LED Night Light. Pick-A-Flow speed selector allows you to select the proper CFM (50-80-110 or 110-130-150 CFM) to ventilate whatever size room you need. Learn More
Whisper Comfort ERV is a balanced solution that replaces the air it exhausts while exchanging the heat between incoming and outgoing air. In winter, heat is transferred from the warm outgoing air to the cooler incoming air. In summer, heat is extracted from the warm incoming air and transferred to the cool outgoing air. The result is better air quality and low energy bills. Learn More
WhisperSupply is the only supply fan that cleans the air as it comes in. The WhisperSupply filters outside air through a Merv 8 filter to a deflector that pushes air up and around the walls to avoid drafts and improve comfort. Learn More