After 35 years of performing tests to determine the top products in various industries, we continue to use different categories for testing multiple items and rating their overall quality when comparing each item. The three categories we used to test furnace filters with a size of 16-x-25-x-4 was application, durability, and efficiency.
Application: One of the most challenging parts of purchasing a new furnace filter is installing the product because they may not fit correctly in the appliance. We tested the application of each filter to determine if it fit correctly and was secure after it was installed. Our team also looked for gaps that may be present after it was secured into the furnace, which can cause air to escape back into the building without getting filtered.
Durability: The quality of the parts and materials that are used to construct each furnace filter was carefully examined by our team of experts to determine if it will last longer than similar products in the industry. We also evaluated the condition of the filters in the packaging when they were delivered to look for any damage or defects that were present.
Efficiency: The results that were delivered by each furnace filter was one of our top concerns, which caused us to create a category for efficiency. We reviewed all of the different particles that the filter was capable of trapping and how dirty each filter became after a period of time. The MERV rating was an additional factor we evaluated.