A single exhaust point and a single supply point are part of the main unit.Air that is piped into the home at the supply point is distributed to designated areas using ducts. (i.e., whether or not to recover moisture from the exhaust air)Manufacturers typically recommend choosing based on climate: HRVs are recommended in cold (heating-dominated) or dry climates, and ERVs in humid climates.In humid climates, an ERV reduces the amount of moisture brought in along with outdoor air. [Click to enlarge any image] The air in a tightly sealed home can be up to 10 times more polluted than outdoor air. This proactive approach to … With balanced ventilation, the clean air that's introduced into the home is equalized with the old polluted air that's pushed out of the home. In addition, system configuration will depend on the presence or absence of a central air handler, which can be used to distribute ventilation air.Conceptual diagram of a balanced ventilation systemA common question is which system to install: an ERV or an HRV? The ventilation unit and the ducts are strategically placed so that moist air is removed from rooms like the kitchen and bathrooms and fresh air is filtered into rooms that are often closed off, like bedrooms. The fact that ERVs recover moisture being sent out of the house can be a problem or an advantage—for instance:There are several points to be noted if you plan to use the HRV or ERV to replace bathroom exhaust fans (thus reducing first costs):Copyright 1997-2020, buildingscience.com Corporation| Info-611: Balanced Ventilation Systems (HRVs and ERVs)All buildings require controlled mechanical ventilation, or the controlled, purposeful introduction of outdoor air to the conditioned space. To mitigate this issue, an Balanced ventilation systems are often installed in attics, though the placement may vary based on the home design.
The designs shown here are some of BSC’s recommendations for the best performance. Building enclosures must be “built tight and then ventilated right.” Why? This allows the mechanical ventilation to control the flow of air within the home, rather than relying on While some homeowners utilize existing heating and cooling ducts for ventilation systems, this approach can affect the balance of a ventilation system. This is accomplished through exhaust similar to the supply and exhaust systems; however, the system uses two duct systems and two fans. A balanced ventilation system (as opposed to supply-only or exhaust-only system) has two fans: one bringing outside air into the building, and the other exhausting stale interior air, resulting in roughly balanced airflows. Building intentionally leaky buildings and installing operable windows does not provide sufficient outside air in a consistent manner throughout the year.Some designs or configurations can cause poor distribution, excess air leakage, exacerbated humidity control problems, or poor flow. These approaches are shown schematically in the following figures.A balanced ventilation system (as opposed to supply-only or exhaust-only system) has two fans: one bringing outside air into the building, and the other exhausting stale interior air, resulting in roughly balanced airflows.
Additional options for good performance (as well as configurations to avoid) are discussed in BSC’s In cold climates, the HRV/ERV must be set up to handle condensation of moisture-laden bathroom air (e.g., HRV with condensate drain, defrost). While a tight building envelope is important for energy conservation, A balanced ventilation system introduces fresh outdoor air into a home at the same rate that stale indoor air is exhausted from the home. Balanced ventilation uses both a supply and exhaust fan to provide fresh air while keeping house pressures neutral. Balanced ventilation systems supply fresh air to the living and sleeping areas of homes while exhausting stale air at an equal rate from other areas. If a balanced ventilation system is designed and installed properly, it neither pressurizes or depressurizes the home. These systems do not significantly affect the pressure of the interior space with respect to outdoors.In most balanced ventilation systems, heat—and sometimes moisture—are exchanged between the two airstreams, reducing the heating and cooling loads caused by outside venti… These systems are more complex than supply-only or exhaust-only ventilation systems, but provide better fresh air distribution and in some cases lower energy bills than alternative systems. A balanced ventilation system introduces fresh outdoor air into a home at the same rate that stale indoor air is exhausted from the home. The reverse can be true if the system is set up to balanced when the air handler is on. When a ventilation system is set up to be balanced when an air handler is off, turning the air handler on can unbalance the system and cause supply air volume to increase. Balanced ventilation systems can provide many benefits including: Improved indoor air quality. Air is exhausted from differing designated areas in the home using a different set of ducts and is ultimately expelled through the main exhaust point. Both issues can alter the pressure in the home and cause outside pollutants to be sucked into the home.To maintain proper pressure balances and optimize both ventilation and temperature control, ventilation and air handling systems should be separated and use different duct systems.One unfortunate part about most balanced ventilation systems is that they allow cooled or heated air to escape at a higher rate than usual while bringing in new air to heat or cool in order to maintain comfort. Once you eliminate big holes it becomes easy to control air exchange between the inside and the outside.With a tight building enclosure, both mechanical ventilation and pollutant source control are required to ensure that there is reasonable indoor air quality inside the house.
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balanced ventilation system