BRV Between Room Ventilator
How It Works
When your heating system's air handler comes on, a large quantity of air is pushed and pulled throughout your house. In theory, equal amounts of air should be both delivered to and drawn from each room of the home. If each room doesn't have both a supply duct (which brings the heated or cooled air) and a return duct (which takes room air back to be heated or cooled), then there must be a clear passage for air to get from where it is delivered back to the return duct. A well designed heating and cooling system will make provisions for this transfer.
In many cases, a heating contractor will run only supply ducts into bedrooms, relying on the space under the door (an "undercut") to allow air to flow back to a return duct in a hallway, even if the door is closed. But if the floor height is changed, such as by adding carpet, or the door is replaced without allowing for an undercut, the air being supplied to the bedroom can no longer flow back to the return duct. This causes the return air duct to exert excess pressure on the rest of the house to make up for the air that is not coming from the bedroom. This negative pressure can cause fireplaces, stoves, furnaces and other appliances to fail to exhaust properly.
The BRV acts as a passageway to reconnect the isolated room to the return air duct. It allows air to freely flow back to the return duct without creating undue pressure on the other appliances in the house. But unlike an open door, the unique baffles in the BRV allow this air to flow without also transmitting sound and light between rooms.
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