Product review (2 stars): What I mean by cheapening them is that they didn't put the glue strips on each side of the filter like the last ones I ordered
These filters have been cheapened since my last order 2 years ago.  One of them already started falling apart as I was taking it out of the package, what would it do if it got wet?  What I mean by cheapening them is that they didn't put the glue strips on each side of the filter like the last ones I ordered. One side had 2 glue strips and the other side had 3 glue strips.  The glue strip helps hold them together and give then rigidity when installed so they stand up and hold up.  I took my hot glue gun and put the glue strips on them myself, hoping they will hold up and last through the heating season.