3-PK ReservePro 4541 (old #4511) 16"x25"x5" Air Filter-Actual Size= 15 5/8 x 24 3/16 x 4 15/16-6FM1625 Important: please measure carefully before ordering- returns of this product result in very high costs to the buyer for return shipping New ! Now Shipping Reservepro Model #4541- Higher Efficiency Merv 11 Model.