Product review (1 stars): 1 of 2 collapsed.
I tried these filters instead of Honeywell even though they were about the same price. I used in 2 different units and one of the two collapsed and does not work well in the unit. I read from another user that the same thing happened to them, but most of the reviews said they worked fine.
It appears to be a hit or miss phenomenom. I wouldn't purchase them again.