Buying and receiving of the filters went very smoothly. It was my fault that I didn't get exactly what I wanted--filters that were a little better. The relationship between the 2 systems confused me.
These filters are 1/4 inch smaller on each side in comparison to filters of other brands of the same size. We have gaps and air goes through them but not through filter... unacceptable!
Only been in house 4 day's now, need more time to review, have a very dusty house and do need protection from all air bornes in here, might not getlong life out of them, but will lve with it