Filter-Monster Branded Replacement Filter Compatible with IQAir GC Multigas Medical Grade Pre-Filter H11

Filter-Monster branded compatible with IQAir GC Pre-Filter | Recommended to replace every twelve (12) months for maximum efficiency, or more often depending on air quality and environmental factors | Extends the life of the other filers by capturing fine particles | Approximate Dimensions: 13 x 3 x 13 inches | Approximate Dimensions: 13 x 3 x 13 inches