28x34x1 Aerostar Air Filter

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A 28x34x1 nominal return takes a filter at 28" x 34" x 1" actual, which is what this Aerostar fits. Returns in this size appear on larger residential systems and certain light comm ercial air handlers. MERV 8 covers standard residential dust and pollen filtration. MERV 11 handles pet households and most common allergens. MERV 13 captures fine particulates including bacteria, virus-carrying droplets, and wildfire smoke - the grade for households with respiratory health concerns or in smoke-affected regions. Pleated synthetic media with an electrostatic charge built into the fibers handles the filtration work. The pleats provide substantially more surface area than a flat fiberglass filter would offer at the same nominal size, which is what extends the service life to 60 to 90 days under typical residential conditions. The electrostatic charge improves capture of sub-micron particles where the physical weave alone reaches its filtration limits. Manufactured in the USA by Con-Air Industries at the Orlando, Florida facility. The cardboard frame is reinforced to maintain shape under blower suction. Frame collapse is a common failure point in larger filters because the total suction force scales with filter area, and a collapsed frame allows unfiltered air to bypass the media entirely. This filter is built to hold shape under load. Show more