16x19x4 (15.5 x 18.5 x 3.75) AccumulairA (R) Emerald 4-Inch Filter (APR 450)

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