A fresh air filter box is an HVAC accessory designed to clean outdoor air before it enters
a home or building's ventilation system. Installed in-line with intake ductwork, it removes
particles like dust, pollen, and odors using replaceable MERV, HEPA, or activated carbon filters.
These boxes, typically made of galvanized steel with access doors for maintenance,
improve indoor air quality and protect HVAC equipment.
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