50%of the flutes were crunched up together reducing the surface area. This decrease the life of the filter. I tried to spread out the flutes but was not that successful do to the amount of glue used. Will look at other brands
I have purchased the MERV 13 filters for both of my homes for the past couple of years and notice the difference in the air quality........it's substantially better.
A lot of wasted $$ as I bought 4 of the smelly things. Air is not fresh and clean.. it's a very bad odor. Not sure if it's the glue, or if the cardboard parts are recycled cardboard.. the smell is musty and very offensive. I emailed the company to let them know.