AccumulairA (R) Emerald MERV 6 8 times more efficient than fiberglass filters Durable construction that will not warp or leak under normal operating conditions Excellent for high-velocity systems and maximum airflow Lasts up to three months
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I bought 12x18x2 (Actual Size) AccumulairA (R) Emerald 2-Inch Filter (APR 450) for my child and is very satisfied!