Air intake opening (mechanical)

A mechanical air intake opening is one that draws air into the home using a fan, blower, or other powered means. One example is an outside air intake duct connected to the return boot of a forced-air HVAC system. These ducts are being installed in some new homes to mix outdoor air with the return air to increase air changes per hour in the home and to improve indoor air quality. Another example is a heat recovery or an energy recovery ventilation system.