AeroStar 30x30x1 Air Filter

Square 30x30x1 returns are uncommon enough that hardware stores don't stock them, which is why most homeowners end up ordering direct. This Aerostar measures 29 7/8" x 29 7/8" x 3/4" actual, built to the nominal 30x30x1 spec. Larger-residential applications with a single oversized return often run this size rather than splitting filtration across multiple smaller grilles. MERV 8 covers standard residential filtration. MERV 11 handles pet households and most common allergens. MERV 13 captures fin