Our Series 400 High Capacity MERV 10 filters feature 33% more pleats per linear foot than our standard MERV 8 filter. What does this mean? More pleats simply mean better filtration and less stress on your furnace. A filter with more pleats traps more dust particles and extends the life of the filter meaning you don’t have to change it as often. This filter also offers the lowest initial pressure drop...meaning less stress on your furnace and a lower energy bill! The filter offers a heavy duty, moisture resistant, die-cut frame that will not warp, crack or distort under normal operating conditions.