This filter replaces the original filter sold with the LA2-RC2-HOC and LA2-RC1-HOC. Be sure to check the filter width that you are replacing. The Ultra 4 Carbon filter has a width of 3 and 1/8 inches. The Ultra 6 has a width of 4 and 11/16.
Overall dimensions are 20 x 16 x 3.125 inches and a weight of 7.5 pounds.