These filters were nothing short of great value when originally purchased in 2018 as their construction was nothing short of great. They are reinforced on both sides and do not collapse over time under the action of airflow. In addition, they also have a thin wire woven into the filter material itself, which further guarantees shape retention for maximum filter efficiency. They are also individually wrapped to ensure they enter the ventilation system completely clean. Of all the filter types and brands tested (and I've tested quite a few), these are by far the best in all areas; In short, they easily earn "10" or 5 full stars. The downside is that the price of the Six (6) is up about 50% compared to last year's price, but that doesn't detract from the quality of this item. When they fall back down to a more reasonable price, this reviewer will buy more; Otherwise, another brand will be purchased. As good as they are, they haven't cornered the market in terms of quality.
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