They appear to be durable and arrive well packaged; However, they seem to clog much quicker than expected. I currently change them every three weeks instead of three months. I will return to MERV8. On the one hand the air is filtered better, on the other hand it puts too much stress on my system and we had a noticeable drop in air pressure coming out of the vents throughout the house. This is why I'm still leaving a 4 star review as they are good value and seem to get the job done, they just aren't the right product for my system.
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